Encyclopedia Astronautica
April 21


April 21 Chronology


1944 April 21 - . Launch Site: Heidelager. LV Family: V-2. Launch Vehicle: V-2. LV Configuration: V-2 17342. FAILURE: Failure.
  • V-2 A03 G1 - . Nation: Germany. Summary: Failed - accuracy was 8 km to the right of the planned trajectory..

1949 April 21 - . Launch Site: Wallops Island. LV Family: Deacon. Launch Vehicle: Deacon.
  • E17 Drag Model test flight - . Nation: USA. Agency: NASA. Apogee: 10 km (6 mi).

1951 April 21 - .
1953 April 21 - . Launch Site: Hammaguira. Launch Complex: Hammaguira Bechar. LV Family: Veronique. Launch Vehicle: Veronique. LV Configuration: Veronique N10.
  • Test mission - . Nation: France. Agency: LRBA. Apogee: 45 km (27 mi).

1954 April 21 - . Launch Site: White Sands. LV Family: Honest John. Launch Vehicle: Honest John. LV Configuration: Honest John 479M.
  • Test mission - . Nation: USA. Apogee: 10 km (6 mi).

1955 April 21 - . 15:58 GMT - . Launch Site: Holloman. Launch Complex: Holloman A. LV Family: Aerobee. Launch Vehicle: Aerobee Hi. LV Configuration: Aerobee Hi USAF 55.
  • AJ11-6 engine test - . Nation: USA. Agency: USAF. Apogee: 198 km (123 mi). Summary: First launcing of USAF Aerobee-Hi sounding rocket. Rocket test, 98 kg payload. Launched at 0858 local time. Reached 198 km..

1959 April 21 - . 01:05 GMT - . Launch Site: Holloman. Launch Complex: Holloman A. LV Family: Aerobee. Launch Vehicle: Aerobee 150. LV Configuration: Aerobee 150 AA3.181C.
  • Ionosphere mission - . Nation: USA. Agency: USAF. Apogee: 235 km (146 mi).

1960 April 21 - .
  • SAINT System Development Requirement issued. - . Nation: USA. Spacecraft: SAINT; SAINT II. Summary: It also allowed follow-on manned systems to be pursued..

1960 April 21 - . 10:35 GMT - . Launch Site: Woomera. Launch Complex: Woomera LA2. Launch Pad: LA2 SL. LV Family: Skylark. Launch Vehicle: Skylark 2. LV Configuration: Skylark-2 SL62.
  • Grenades / Chaff Aeronomy mission - . Nation: Australia. Agency: WRE; RAE. Apogee: 141 km (87 mi).

1960 April 21 - . 15:00 GMT - . Launch Site: Eglin. LV Family: Aerobee. Launch Vehicle: Aerobee 150. LV Configuration: Aerobee 150 AA3.283C.
  • Magnetometer Fields mission - . Nation: USA. Agency: USAF. Apogee: 245 km (152 mi).

1960 April 21 - . 20:55 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC15. LV Family: Titan. Launch Vehicle: Titan 1. LV Configuration: Titan I G-6.
  • RVX-4 test - . Nation: USA. Agency: USAF. Apogee: 1,000 km (600 mi).

1961 April 21 - . Launch Site: Baikonur. Launch Complex: Baikonur LC41/4. Launch Pad: LC41/pad?. LV Family: R-16. Launch Vehicle: R-16. LV Configuration: R-16 6L-11T. FAILURE: Failure.
  • Test mission - . Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi).

1961 April 21 - . 00:12 GMT - . Launch Site: Wallops Island. LV Family: Asp. Launch Vehicle: Nike Asp. LV Configuration: Nike Asp NASA 03.06CA. FAILURE: Failure.
  • Sodium release Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 180 km (110 mi).

1961 April 21 - . 02:26 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC51. LV Family: R-9. Launch Vehicle: Romashka. LV Configuration: R-9 No. E10309.
  • State trials missile test - . Nation: USSR. Agency: RVSN. Apogee: 1,160 km (720 mi).

1961 April 21 - . 09:34 GMT - . Launch Site: Wallops Island. LV Family: Asp. Launch Vehicle: Nike Asp. LV Configuration: Nike Asp NASA 03.07CA. FAILURE: Failure.
  • Sodium release Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 200 km (120 mi).

1961 April 21 - . 09:39 GMT - . Launch Site: Wallops Island. LV Family: Asp. Launch Vehicle: Nike Asp. LV Configuration: Nike Asp NASA 03.08CA.
  • Sodium release Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 165 km (102 mi).

1961 April 21 - . 12:00 GMT - . Launch Site: Wallops Island. LV Family: Aerobee. Launch Vehicle: Aerobee 150A. LV Configuration: Aerobee 150A NASA 04.39NP.
  • LeRC LH2 test Technology test - . Nation: USA. Agency: NASA. Apogee: 154 km (95 mi).

1961 April 21 - . 18:05 GMT - . Launch Site: Hidden Hills DZ. Launch Pad: 36.1 N x 116.0 W. Launch Platform: NB-52 003. LV Family: X-15. Launch Vehicle: X-15. LV Configuration: X-15 2-15-29. FAILURE: Three hardware problems during flight..
  • X-15A Mach 4, Aero test - . Nation: USA. Agency: NASA; USAF. Apogee: 32 km (19 mi). Summary: Maximum Speed - 4946 kph. Maximum Altitude - 32000 m..

1962 April 21 - .
  • Titov tour - . Nation: USSR. Related Persons: Titov; Johnson, Lyndon. Summary: Titov is to go to New York, San Francisco, Seattle, and meet Vice President Lyndon Johnson. He is to head back on 1 May..

1962 April 21 - .
1964 April 21 - . 06:15 GMT - . Launch Site: Johnston Island. Launch Complex: Johnston Island LE2. LV Family: Delta. Launch Vehicle: Thor DSV-2J. LV Configuration: Thor DSV-2J 290 (20003).
  • AFP-437 combat training interceptor mission - . Nation: USA. Agency: USAF. Apogee: 778 km (483 mi).

1964 April 21 - . 18:50 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2E. LV Family: Delta. Launch Vehicle: Thor Able-Star. LV Configuration: Thor Ablestar-2 379 AB014. FAILURE: Failure. Failed Stage: U.
  • Transit 5BN-3 - . Mass: 75 kg (165 lb). Nation: USA. Agency: USN. Program: Transit. Class: Navigation. Type: Navigation satellite. Spacecraft: Transit. Decay Date: 1964-04-21 . COSPAR: F640421A. Summary: Carried SNAP-9A nuclear power source. After this launch failure it was decided that operational Transits would be solar-powered only..
  • Transit 5E-4 - . Nation: USA. Agency: USN. Program: Transit. Class: Earth. Type: Magnetosphere satellite. Spacecraft: Transit. COSPAR: F640421B. Summary: Radiation monitoring..

1964 April 21 - . 23:56 GMT - . Launch Site: Fort Churchill. LV Family: Black Brant. Launch Vehicle: Black Brant 3. LV Configuration: Black Brant III FF-3-09.
  • Test mission - . Nation: Canada. Agency: NRCC. Apogee: 150 km (90 mi).

1965 April 21 - . LV Family: Titan. Launch Vehicle: Titan 2.
  • The Combined Systems Acceptance Test (CSAT) of Gemini launch vehicle (GLV) 5 was conducted in the vertical test facility at Martin-Baltimore. - . Nation: USA. Flight: Gemini 5. Four earlier CSAT attempts (April 15-20) were marred by numerous minor anomalies. The vehicle acceptance team inspection began April 26 and concluded April 30, with GLV-5 found acceptable. The vehicle was removed from the test cell May 7-8, formally accepted by the Air Force May 15, and shipped to Cape Kennedy. Stage I arrived at the Cape on May 17 and stage II on May 19.

1965 April 21 - . 11:02 GMT - . Launch Site: Woomera. Launch Complex: Woomera LA5B. Launch Pad: LA5B?. LV Family: Black Knight. Launch Vehicle: Black Knight 301/C2. LV Configuration: Black Knight-301/C2 BK.21.
  • Dazzle re-entry vehicle test - . Nation: UK. Agency: RAE. Apogee: 651 km (404 mi).

1966 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 643. LV Family: Polaris. Launch Vehicle: Polaris A3. LV Configuration: Polaris A3P-437.
  • Operational test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1966 April 21 - . Launch Site: Baikonur. LV Family: UR-100. Launch Vehicle: UR-100. FAILURE: Failure.
  • Joint flight trials launch - . Nation: USSR. Agency: RVSN. Apogee: 0 km ( mi).

1966 April 21 - . 00:06 GMT - . Launch Site: Woomera. Launch Complex: Woomera LA2. Launch Pad: LA2 SL. LV Family: Skylark. Launch Vehicle: Skylark 2. LV Configuration: Skylark 2 SL583.
  • Test mission - . Nation: Australia. Agency: WRE; RAE. Apogee: 193 km (119 mi).

1966 April 21 - . 02:10 GMT - . Launch Site: Tonopah. LV Family: Apache. Launch Vehicle: Nike Apache.
  • Sandia 154-75 Aeronomy mission - . Nation: USA. Agency: Sandia. Apogee: 160 km (90 mi).

1966 April 21 - . 11:25 GMT - . Launch Site: White Sands. Launch Complex: White Sands LC35. LV Family: Aerobee. Launch Vehicle: Aerobee 150. LV Configuration: Aerobee 150 NASA 04.165UA.
  • JHU UVT F1 (Venus) Ultraviolet astronomy mission - . Nation: USA. Agency: NASA. Apogee: 154 km (95 mi).

1966 April 21 - . 16:00 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 643. LV Family: Polaris. Launch Vehicle: Polaris A3. LV Configuration: Polaris A3P-440.
  • Operational test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1966 April 21 - . 16:30 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 643. LV Family: Polaris. Launch Vehicle: Polaris A3. LV Configuration: Polaris A3P-431.
  • Operational test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1967 April 21 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF03. LV Family: Minuteman. Launch Vehicle: Minuteman 1B. LV Configuration: Minuteman 1B 1296.
  • Follow-on operational missile test - . Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi).

1967 April 21 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF22. LV Family: Minuteman. Launch Vehicle: Minuteman 2. LV Configuration: Minuteman 2 2137.
  • ST Olympic Trials 1 operational test launch - . Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi).

1968 April 21 - .
  • L1 on schedule; N1 in trouble. - . Nation: USSR. Related Persons: Mishin. Program: Lunar L1; Lunar L3. Spacecraft: Soyuz 7K-L1. This was a reserve day in the L1 countdown, in case of problems in preparation. However all is on schedule for the launch. The same cannot be said for the N1. There are many delays. Mishin promised the first N1 rollout in the first half of March, but it is still in the assembly building, with no end in sight of preparations. The weather at the cosmodrome is -5 deg at night, clear pleasant days. The Hotel Kosmonavt was finished on 15 April. Although it has all of its furniture, it was not completely painted before the furniture was moved in!

1968 April 21 - . 04:20 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. Launch Pad: LC1 or LC31. LV Family: R-7. Launch Vehicle: Molniya 8K78M.
  • Molniya 1-08 - . Payload: Molniya-1. Mass: 1,600 kg (3,500 lb). Nation: USSR. Agency: MOM. Program: Molniya. Class: Communications. Type: Military communications satellite. Spacecraft: Molniya-1. Decay Date: 1974-01-29 . USAF Sat Cat: 3209 . COSPAR: 1968-035A. Apogee: 40,099 km (24,916 mi). Perigee: 405 km (251 mi). Inclination: 64.0000 deg. Period: 720.80 min. Summary: Operation of a system of long range telephone-telegraph radiocommunication, and transmission of USSR Central Television programmes to the stations of the Orbita network..

1969 April 21 - . LV Family: Shuttle. Launch Vehicle: Shuttle.
  • Space Shuttle Task Group formed - . Nation: USA. Program: STS. Summary: The Director of Apollo Test in the NASA Hq. Apollo Program Office, LeRoy E. Day, was detailed to head the MSF Space Shuttle Task Group. The group would provide NASA with material for a report on the Space Shuttle to the President's Space Task Group..

1969 April 21 - .
1969 April 21 - . 13:06 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma mission - . Nation: USSR. Agency: AN. Apogee: 173 km (107 mi).

1969 April 21 - . 15:26 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. LV Family: MR-12. Launch Vehicle: MR-12.
  • Solar Extreme ultraviolet mission - . Nation: USSR. Agency: AN. Apogee: 176 km (109 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: Vandenberg. Launch Complex: Vandenberg LF24. LV Family: Minuteman. Launch Vehicle: Minuteman 2. LV Configuration: Minuteman 2 2474.
  • OT GT48F operational test launch - . Nation: USA. Agency: USAF SAC. Apogee: 1,300 km (800 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 608. LV Family: Polaris. Launch Vehicle: Polaris A2.
  • Operational missile test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1970 April 21 - . 06:01 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. LV Family: MR-12. Launch Vehicle: MR-12.
  • Ionosphere mission - . Nation: USSR. Apogee: 175 km (108 mi).

1970 April 21 - . 20:42 GMT - . Launch Site: South Uist. LV Family: Petrel. Launch Vehicle: Petrel 1. LV Configuration: Petrel P36H.
  • Particles Ionosphere mission - . Nation: UK. Agency: SRC. Apogee: 139 km (86 mi).

1971 April 21 - .
  • Rain at the cosmodrome jeopardises Soyuz 10 launch. - . Nation: USSR. Program: Salyut. Flight: Soyuz 10.

1971 April 21 - . LV Family: Shuttle. Launch Vehicle: Shuttle.
  • Shuttle SSME Protest - . Nation: USA. Summary: Pratt and Whitney filed a protest against NASA's award to Rocketdyne of the SSME contract. This action prevented further work on Rocketdyne's contract until the issue was adjudicated..

1971 April 21 - . Launch Site: Kwajalein. Launch Complex: Kwajalein Meck. Launch Vehicle: Spartan.
  • Safeguard M1-7A Interceptor mission - . Nation: USA. Agency: USA. Apogee: 100 km (60 mi).

1971 April 21 - . 18:59 GMT - . Launch Site: Kiruna. LV Family: Petrel. Launch Vehicle: Petrel 1. LV Configuration: Petrel P64K.
  • E field Ionosphere mission - . Nation: UK. Agency: SRC. Apogee: 143 km (88 mi).

1971 April 21 - . 21:42 GMT - . Launch Site: Kiruna. LV Family: Petrel. Launch Vehicle: Petrel 1. LV Configuration: Petrel P67K.
  • Winds / E field Aurora mission - . Nation: UK. Agency: SRC. Apogee: 128 km (79 mi).

1971 April 21 - . 23:03 GMT - . Launch Site: Kiruna. LV Family: Petrel. Launch Vehicle: Petrel 1. LV Configuration: Petrel P63K.
  • E field Ionosphere mission - . Nation: UK. Agency: SRC. Apogee: 165 km (102 mi).

1972 April 21 - . LV Family: Shuttle. Launch Vehicle: Shuttle.
  • Shuttle SSME Contract - . Nation: USA. Summary: Rocketdyne finally receives the contact for development of the shuttle main engine. By the end of the century the total value will have exceeded $5.6 billion..

1972 April 21 - . 11:59 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC133/1. LV Family: Kosmos 2. Launch Vehicle: Kosmos 11K63.
  • Cosmos 487 - . Payload: DS-P1-Yu s/n 57. Mass: 325 kg (716 lb). Nation: USSR. Agency: MO. Program: DS. Class: Military. Type: Military target satellite. Spacecraft: DS-P1-Yu. Completed Operations Date: 1972-09-24 . Decay Date: 1972-09-24 . USAF Sat Cat: 6006 . COSPAR: 1972-033A. Apogee: 504 km (313 mi). Perigee: 269 km (167 mi). Inclination: 70.0000 deg. Period: 92.20 min. Summary: Development of systems for air defence and the control of outer space..

1972 April 21 - . 15:13 GMT - . Launch Site: White Sands. Launch Complex: White Sands LC35. LV Family: Aerobee. Launch Vehicle: Aerobee 150. LV Configuration: Aerobee 150 NASA 04.208UA.
  • Aeronomy mission - . Nation: USA. Agency: NASA. Apogee: 200 km (120 mi).

1972 April 21 - . 16:47 GMT - .
  • EVA Apollo 16-1 - . Crew: Young; Duke. EVA Type: Extra-Vehicular Activity. EVA Duration: 0.30 days. Nation: USA. Related Persons: Young; Duke. Program: Apollo. Class: Moon. Type: Manned lunar lander. Flight: Apollo 16. Spacecraft: Apollo LM. Summary: Explored lunar surface near LM and deployed ALSEP unmanned scientific station equipment..

1973 April 21 - . 09:00 GMT - . Launch Site: Kheysa. LV Family: M-100. Launch Vehicle: M-100.
  • - . Nation: USSR. Apogee: 83 km (51 mi).

1974 April 21 - . 15:00 GMT - . Launch Site: Kerguelen. LV Family: M-100. Launch Vehicle: M-100.
  • - . Nation: USSR. Apogee: 97 km (60 mi).

1975 April 21 - . 08:11 GMT - . Launch Site: Thumba. LV Family: Belier. Launch Vehicle: Centaure. LV Configuration: Centaure ISRO 5.26.
  • ISRO 5.26 CO.22 Ionosphere mission - . Nation: India. Agency: ISRO. Apogee: 157 km (97 mi).

1975 April 21 - . 09:07 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.302-1.
  • AEOLUS Release Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 213 km (132 mi).

1975 April 21 - . 09:07 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.302-2.
  • AEOLUS Release Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 220 km (130 mi).

1975 April 21 - . 09:12 GMT - . Launch Site: Fort Churchill. LV Family: Tomahawk Sandia. Launch Vehicle: Paiute Tomahawk. LV Configuration: Paiute Tomahawk CRL A10.403-1.
  • AEOLUS Mass Spectrometer Aeronomy mission - . Nation: USA. Agency: USAF CRL. Apogee: 222 km (137 mi).

1975 April 21 - . 17:30 GMT - . Launch Site: Thumba. LV Family: Belier. Launch Vehicle: Centaure. LV Configuration: Centaure ISRO 5.27.
  • ISRO 5.27 CO.21 Ionosphere mission - . Nation: India. Agency: ISRO. Apogee: 156 km (96 mi).

1976 April 21 - . 10:00 GMT - . Launch Site: White Sands. LV Family: Aerobee. Launch Vehicle: Aerobee 200A. LV Configuration: Aerobee 200A NASA 26.49DH.
  • NRL XR X-ray astronomy mission - . Nation: USA. Agency: NASA. Apogee: 202 km (125 mi).

1977 April 21 - . 17:00 GMT - . Launch Site: White Sands. LV Family: Aerobee. Launch Vehicle: Aerobee 170. LV Configuration: Aerobee 170 GL A04.410-02.
  • Solar ultraviolet / solar extreme ultraviolet mission - . Nation: USA. Agency: USAF GL. Apogee: 237 km (147 mi).

1978 April 21 - . LV Family: Shuttle. Launch Vehicle: Shuttle.
  • Shuttle MPTA First test - . Nation: USA. Summary: For the first time three SSME engines are run on the MPTA test article mated to an external tank - for 2.5 seconds..

1978 April 21 - .
  • First static firing, MPTA-098 - . Nation: USA. Program: STS. Summary: First static firing, MPTA-098, NSTL (2.5 seconds; stub nozzles).

1978 April 21 - . 05:29 GMT - . Launch Site: Atlantic Ocean. Launch Pad: 38.0 N x 75.0 W. Launch Platform: VISE. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma/Solar mission - . Nation: USSR. Apogee: 170 km (100 mi).

1978 April 21 - . 06:26 GMT - . Launch Site: Atlantic Ocean. Launch Pad: 38.0 N x 75.0 W. Launch Platform: VISE. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma/Solar mission - . Nation: USSR. Apogee: 170 km (100 mi).

1978 April 21 - . 07:52 GMT - . Launch Site: Atlantic Ocean. Launch Pad: 38.0 N x 75.0 W. Launch Platform: VISE. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma/Solar mission - . Nation: USSR. Apogee: 150 km (90 mi).

1978 April 21 - . 17:40 GMT - . Launch Site: Atlantic Ocean. Launch Pad: 38.0 N x 75.0 W. Launch Platform: VISE. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma/Solar mission - . Nation: USSR. Apogee: 170 km (100 mi).

1978 April 21 - . 18:30 GMT - . Launch Site: Atlantic Ocean. Launch Pad: 38.0 N x 75.0 W. Launch Platform: VISE. LV Family: MR-12. Launch Vehicle: MR-12.
  • Aeronomy/Plasma/Solar mission - . Nation: USSR. Apogee: 170 km (100 mi).

1979 April 21 - . 10:10 GMT - . Launch Site: White Sands. LV Family: Black Brant. Launch Vehicle: Black Brant 8C. LV Configuration: Black Brant 8C NASA 27.38UE.
  • Plasma mission - . Nation: USA. Agency: NASA. Apogee: 317 km (196 mi).

1980 April 21 - . 21:47 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 656. Launch Vehicle: Poseidon.
  • FOT-40? Follow-on operational missile test - . Nation: USA. Agency: USN. Apogee: 500 km (310 mi).

1980 April 21 - . 21:47 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 656. Launch Vehicle: Poseidon.
  • FOT-40? Follow-on operational missile test - . Nation: USA. Agency: USN. Apogee: 500 km (310 mi).

1980 April 21 - . 21:47 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 656. Launch Vehicle: Poseidon.
  • FOT-40? Follow-on operational missile test - . Nation: USA. Agency: USN. Apogee: 500 km (310 mi).

1980 April 21 - . 21:48 GMT - . Launch Site: ETR Launch Area. Launch Platform: SSBN 656. Launch Vehicle: Poseidon.
  • FOT-40? Follow-on operational missile test - . Nation: USA. Agency: USN. Apogee: 500 km (310 mi).

1981 April 21 - . 03:45 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC90/19. Launch Pad: LC90/pad?. LV Family: Tsiklon. Launch Vehicle: Tsiklon-2.
  • Cosmos 1266 - . Mass: 3,800 kg (8,300 lb). Nation: USSR. Agency: MO. Program: RORSAT. Class: Surveillance. Type: Military naval surveillance radar satellite. Spacecraft: US-A. Decay Date: 1981-05-20 . USAF Sat Cat: 12429 . COSPAR: 1981-037B. Apogee: 941 km (584 mi). Perigee: 911 km (566 mi). Inclination: 64.8000 deg. Period: 103.60 min. Summary: Ocean surveillance; nuclear powered..

1982 April 21 - . 01:40 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar LC107/1. LV Family: Kosmos 3. Launch Vehicle: Kosmos 11K65M. LV Configuration: Kosmos 11K65M 53767-256.
  • Cosmos 1351 - . Mass: 550 kg (1,210 lb). Nation: USSR. Agency: MO. Class: Military. Type: Radar calibration target. Spacecraft: Taifun-2. Decay Date: 1983-03-14 . USAF Sat Cat: 13142 . COSPAR: 1982-034A. Apogee: 548 km (340 mi). Perigee: 348 km (216 mi). Inclination: 50.7000 deg. Period: 93.60 min. Summary: Released 25 Romb radar calibration subsatellites..

1982 April 21 - . 09:15 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. Launch Pad: LC1 or LC31. LV Family: R-7. Launch Vehicle: Soyuz 11A511U.
  • Cosmos 1352 - . Mass: 6,300 kg (13,800 lb). Nation: USSR. Agency: MOM. Class: Surveillance. Type: Military surveillance satellite. Spacecraft: Zenit-6U. Duration: 14.00 days. Decay Date: 1982-05-05 . USAF Sat Cat: 13144 . COSPAR: 1982-035A. Apogee: 364 km (226 mi). Perigee: 204 km (126 mi). Inclination: 70.4000 deg. Period: 90.10 min. Summary: Photo surveillance; returned film capsule..

1983 April 21 - . 14:00 GMT - . Launch Site: Thumba. LV Family: M-100. Launch Vehicle: M-100.
  • - . Nation: USSR. Apogee: 83 km (51 mi).

1986 April 21 - . 14:23 GMT - . Launch Site: Kapustin Yar. Launch Complex: Kapustin Yar V-2. LV Family: M-100. Launch Vehicle: M-100B.
  • - . Nation: USSR. Apogee: 79 km (49 mi).

1987 April 21 - . 15:14 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC1. LV Family: R-7. Launch Vehicle: Soyuz 11A511U2.
  • Progress 29 - . Payload: Progress s/n 127. Mass: 7,100 kg (15,600 lb). Nation: USSR. Agency: MOM. Program: Mir. Class: Manned. Type: Manned logistics spacecraft. Flight: Mir EO-2; Mir LD-1. Spacecraft: Progress. Duration: 19.72 days. Completed Operations Date: 1987-05-11 08:27:43 . Decay Date: 1987-05-11 08:27:43 . USAF Sat Cat: 17878 . COSPAR: 1987-034A. Apogee: 237 km (147 mi). Perigee: 189 km (117 mi). Inclination: 51.6000 deg. Period: 88.80 min. Unmanned supply vessel to Mir. Deorbited May 11, 1987. Docked with Mir at 343 X 363 1705 23 April at rear port of Kvant. Undocked May 11 03:10. Deorbited28 May 02:59 .
    Officially: Transporting sundry cargoes to the Mir orbital station. Docked with Salyut 7 on 23 Apr 1987 17:04:51 GMT. Undocked on 11 May 1987 03:10:01 GMT. Destroyed in reentry on 11 May 1987 08:28:00 GMT. Total free-flight time 2.30 days. Total docked time 17.42 days.

1988 April 21 - . 11:35 GMT - . Launch Site: Thumba. LV Family: M-100. Launch Vehicle: M-100B.
  • - . Nation: USSR. Apogee: 81 km (50 mi).

1990 April 21 - . 10:15 GMT - . Launch Site: White Sands. Launch Complex: White Sands LC36. LV Family: Black Brant. Launch Vehicle: Black Brant 9. LV Configuration: Black Brant IX NASA 36.73UG.
  • JHU FOT 9 (C / Austin) Ultraviolet astronomy mission - . Nation: USA. Agency: NASA. Apogee: 300 km (180 mi).

1993 April 21 - . 00:23 GMT - . Launch Site: Plesetsk. Launch Complex: Plesetsk LC43/4. LV Family: R-7. Launch Vehicle: Molniya 8K78M. LV Configuration: Molniya 8K78M-ML.
  • Molniya 3-44 - . Payload: Molniya-3 s/n 57. Mass: 1,600 kg (3,500 lb). Nation: Russia. Agency: MOM. Program: Molniya. Class: Communications. Type: Military communications satellite. Spacecraft: Molniya-3. Decay Date: 2004-01-25 . USAF Sat Cat: 22633 . COSPAR: 1993-025A. Apogee: 39,603 km (24,608 mi). Perigee: 744 km (462 mi). Inclination: 62.9000 deg. Period: 717.70 min. Summary: Operation of the long-range telephone and telegraph radio communications system, transmission of television programmes to stations in the Orbita network and international cooperation. Replaced Molniya 3-41..

1995 April 21 - . 01:44 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA2. LV Family: Ariane. Launch Vehicle: Ariane 40. LV Configuration: Ariane 40+ V72.
  • ERS 2 - . Mass: 2,516 kg (5,546 lb). Nation: Europe. Agency: ESA. Class: Earth. Type: Earth resources radar satellite. Spacecraft: ERS 1-2. USAF Sat Cat: 23560 . COSPAR: 1995-021A. Apogee: 785 km (487 mi). Perigee: 784 km (487 mi). Inclination: 98.6000 deg. Period: 100.50 min. Summary: European Remote Sensing; carried SAR; ocean, land, ice, and atmospheric observations..

1995 April 21 - . 15:04 GMT - . Launch Site: White Sands. Launch Vehicle: THAAD. LV Configuration: THAAD FT-01.
  • Test mission - . Nation: USA. Agency: USA. Apogee: 100 km (60 mi).

1996 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 738. LV Family: Trident. Launch Vehicle: Trident D-5. LV Configuration: Trident D-5 FCET-14.
  • Operational test - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1996 April 21 - . Launch Site: ETR Launch Area. Launch Platform: SSBN 738. LV Family: Trident. Launch Vehicle: Trident D-5. LV Configuration: Trident D-5 FCET-14.
  • - . Nation: USA. Agency: USN. Apogee: 1,000 km (600 mi).

1997 April 21 - . 11:59 GMT - . Launch Site: Gran Canaria DZ. Launch Pad: 27.0 N x 15.3 W. Launch Platform: L-1011. LV Family: Pegasus. Launch Vehicle: Pegasus XL. LV Configuration: Pegasus XL F15.
  • Minisat-01 - . Mass: 209 kg (460 lb). Nation: USA. Agency: INTA. Manufacturer: CASA. Class: Technology. Type: Navigation technology satellite. Spacecraft: Minisat. Decay Date: 2002-02-26 . USAF Sat Cat: 24779 . COSPAR: 1997-018A. Apogee: 580 km (360 mi). Perigee: 561 km (348 mi). Inclination: 151.0000 deg. Period: 96.00 min. Summary: Minisat-01 carried the EURD extreme ultraviolet spectrograph to study interstellar gas, the LEGRI gamma ray burst detector, and the CPLM microacceleration in liquids experiment..
  • Celestis - . Payload: CPAC. Nation: USA. Agency: OSC. Manufacturer: Germantown. Program: Celestis. Class: Burial . Type: Burial satellite. Spacecraft: CPAC. Decay Date: 2002-05-21 . USAF Sat Cat: 24780 . COSPAR: 1997-018B. Apogee: 581 km (361 mi). Perigee: 553 km (343 mi). Inclination: 151.0000 deg. Period: 96.00 min.

1998 April 21 - .
  • Chinese Manned Spacecraft Launch Set for 1999 - . Nation: China. Spacecraft: Shenzhou. Preparations for the first test launch of China's first manned spacecraft were underway at the launch site, a Shanghai newspaper reported. It said the first flight would be launched in late 1999. The space cabin, telemetry system and power system had been developed in Shanghai.

1998 April 21 - .
  • China Completed New Wind Tunnels For Space Development - . Nation: China. Two special wind tunnels in southwest China's Sichuan Province were nearing completion. The new tunnels would be used for testing China's future space shuttle, launch vehicles, and strategic missiles. A high-frequency plasma wind tunnel and a supersonic flow wind tunnel were being built by China Aerodynamics Research and Development Center and would be the most advanced in Asia.

1999 April 21 - . 04:59 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC109. Launch Pad: LC109/95. LV Family: R-36M. Launch Vehicle: Dnepr. LV Configuration: Dnepr 6703542509.
  • UoSAT-12 - . Mass: 325 kg (716 lb). Nation: UK. Agency: Surrey. Manufacturer: Surrey. Class: Technology. Type: Navigation technology satellite. Spacecraft: MiniSat-400. USAF Sat Cat: 25693 . COSPAR: 1999-021A. Apogee: 654 km (406 mi). Perigee: 639 km (397 mi). Inclination: 64.6000 deg. Period: 97.70 min. First launch of Russia's Dnepr launch vehicle, a converted R-36M2 ICBM. The Dnepr was launched from a silo. The third stage maneuvring bus (used on the ICBM for dispensing multiple warheads) placed UoSAT-12 into a 638 km x 652 km x 64.6 deg orbit. The third stage separated from the payload at 05:13 GMT and then made a burn into a 599 km x 1403 km x 64.6 deg orbit. UoSAT-12 was the first test of the Minibus platform, at 325 kg a larger spacecraft than earlier 50 kg Surrey UoSATs. It carried a mobile radio experiment (MERLION), a GPS receiver, and imaging cameras.

2001 April 21 - .
  • STS-100 Mission Status Report #04 - . Nation: USA. Related Persons: Ashby; Guidoni; Hadfield; Helms; Lonchakov; Parazynski; Phillips; Rominger; Voss. Program: ISS. Flight: ISS EO-2; STS-100. Space Shuttle Endeavour and its seven crewmembers began rendezvous preparations shortly after 3 a.m. today, which should culminate in an 8:32 a.m. docking to the International Space Station, which will be northeast of Hong Kong at an altitude of 240 miles. The shuttle is bringing an advanced robotic arm, experiments and supplies to the ever-growing science outpost. Additional Details: STS-100 Mission Status Report #04.

2006 April 21 - .
2007 April 21 - . 12:31 GMT - .
2008 April 21 - .
  • ISS EO-16: Expedition 16 Crew Lands in Kazakhstan - . Summary: Commander Peggy Whitson and cosmonaut Yuri Malenchenko of the 16th International Space Station crew landed on the steppes of Kazakhstan around 4:30 a.m. EDT Saturday after 192 days in space.. Additional Details: ISS EO-16: Expedition 16 Crew Lands in Kazakhstan .

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