The Space Calendar is updated monthly and the latest copy is available at ames.arc.nasa.gov in the /pub/SPACE/FAQ.  Please send any updates or corrections to Ron Baalke (baalke@kelvin.jpl.nasa.gov).  Note that launch dates are subject to change.       The following person made contributions to this month's calendar:          o Dennis Newkirk - Soyuz TM-18 Launch Date (Dec 1993).                             =========================                                SPACE CALENDAR                                April 27, 1993                           =========================  * indicates change from last month's calendar  April 1993 * Apr 29 - Astra 1C Ariane Launch  May 1993   May ?? - Advanced Photovoltaic Electronics Experiment (APEX) Pegasus Launch   May ?? - Radcal Scout Launch   May ?? - GPS/PMQ Delta II Launch * May ?? - Commercial Experiment Transporter (COMET) Conestoga Launch * May 01 - Astronomy Day * May 01-2 - Iapetus/Saturn Eclipse   May 04 - Galileo Enters Asteroid Belt Again   May 04 - Eta Aquarid Meteor Shower (Maximum: 21:00 UT, Solar Lon: 44.5 deg) * May 13 - Air Force Titan 4 Launch * May 18 - STS-57, Endeavour, European Retrievable Carrier (EURECA-1R) * May 20 - 15th Anniversary, Pioneer Venus Orbiter Launch   May 21 - Partial Solar Eclipse, Visible from North America & Northern Europe   May 25 - Magellan, Aerobraking Begins  June 1993   Jun ?? - Temisat Meteor 2 Launch   Jun ?? - UHF-2 Atlas Launch   Jun ?? - NOAA-I Atlas Launch   Jun ?? - First Test Flight of the Delta Clipper (DC-X), Unmanned   Jun ?? - Hispasat 1B & Insat 2B Ariane Launch   Jun 04 - Lunar Eclipse, Visible from North America   Jun 14 - Sakigake, 2nd Earth Flyby (Japan)   Jun 22 - 15th Anniversary of Charon Discovery (Pluto's Moon) by Christy   Jun 30 - STS-51, Discovery, Advanced Communications Technology Satellite  July 1993   Jul ?? - MSTI-II Scout Launch   Jul ?? - Galaxy 4 Ariane Launch   Jul 01 - Soyuz Launch (Soviet)   Jul 08 - Soyuz Launch (Soviet)   Jul 14 - Soyuz TM-16 Landing (Soviet) * Jul 20-21 - Iapetus/Saturn Eclipse   Jul 21 - Soyuz TM-17 Landing (Soviet)   Jul 28 - S. Delta Aquarid Meteor Shower (Maximum: 19:00 UT,            Solar Longitude 125.8 degrees)   Jul 29 - NASA's 35th Birthday  August 1993   Aug ?? - ETS-VI (Engineering Test Satellite) H2 Launch (Japan)   Aug ?? - GEOS-J Launch   Aug ?? - Landsat 6 Launch   Aug ?? - ORBCOM FDM Pegasus Launch * Aug 08 - 15th Anniversary, Pioneer Venus 2 Launch (Atmospheric Probes)   Aug 09 - Mars Observer, 4th Trajectory Correction Maneuver (TCM-4)   Aug 12 - N. Delta Aquarids Meteor Shower (Maximum: 07:00 UT,            Solar Longitude 139.7 degrees)   Aug 12 - Perseid Meteor Shower (Maximum: 15:00 UT,            Solar Longitude 140.1 degrees)   Aug 24 - Mars Observer, Mars Orbit Insertion (MOI)   Aug 25 - STS-58, Columbia, Spacelab Life Sciences (SLS-2)   Aug 28 - Galileo, Asteroid Ida Flyby  September 1993   Sep ?? - SPOT-3 Ariane Launch   Sep ?? - Tubsat Launch   Sep ?? - Seastar Pegasus Launch  October 1993   Oct ?? - Intelsat 7 F1 Ariane Launch   Oct ?? - SLV-1 Pegasus Launch   Oct ?? - Telstar 4 Atlas Launch   Oct 01 - SeaWIFS Launch   Oct 22 - Orionid Meteor Shower (Maximum: 00:00 UT, Solar Longitude            208.7 degrees)  November 1993   Nov ?? - Solidaridad/MOP-3 Ariane Launch   Nov 03 - 20th Anniversary, Mariner 10 Launch (Mercury & Venus Flyby Mission)   Nov 03 - S. Taurid Meteor Shower   Nov 04 - Galileo Exits Asteroid Belt   Nov 06 - Mercury Transits Across the Sun, Visible from Asia, Australia, and            the South Pacific * Nov 08 - Mars Observer, Mapping Orbit Established   Nov 10 - STS-60, Discovery, SPACEHAB-2   Nov 13 - Partial Solar Eclipse, Visible from Southern Hemisphere   Nov 15 - Wilhelm Herschel's 255th Birthday   Nov 17 - Leonids Meteor Shower (Maximum: 13:00 UT, Solar Longitude            235.3 degrees) * Nov 22 - Mars Observer, Mapping Begins   Nov 28-29 - Total Lunar Eclipse, Visible from North America & South America  December 1993   Dec ?? - GOES-I Atlas Launch   Dec ?? - NATO 4B Delta Launch   Dec ?? - TOMS Pegasus Launch   Dec ?? - DirectTv 1 & Thiacom 1 Ariane Launch   Dec ?? - ISTP Wind Delta-2 Launch   Dec ?? - STEP-2 Pegasus Launch * Dec ?? - Soyuz TM-18 Launch (Soviet)   Dec 02 - STS-61, Endeavour, Hubble Space Telescope Repair   Dec 04 - SPEKTR-R Launch (Soviet) * Dec 05 - 20th Anniversary, Pioneer 10 Jupiter Flyby   Dec 08 - Mars Observer, Mars Equinox   Dec 14 - Geminids Meteor Shower (Maximum: 00:00 UT,            Solar Longitude 262.1 degrees)   Dec 20 - Mars Observer, Solar Conjunction Begins   Dec 23 - Ursids Meteor Shower (Maximum: 01:00 UT,            Solar Longitude 271.3 degrees)  January 1994   Jan 03 - Mars Observer, End of Solar Conjunction   Jan 24 - Clementine Titan IIG Launch (Lunar Orbiter, Asteroid Flyby Mission)  February 1994   Feb ?? - SFU Launch   Feb ?? - GMS-5 Launch   Feb 05 - 20th Anniversary, Mariner 10 Venus Flyby   Feb 08 - STS-62, Columbia, U.S. Microgravity Payload (USMP-2)   Feb 15 - Galileo's 430th Birthday   Feb 21 - Clementine, Lunar Orbit Insertion   Feb 25 - 25th Anniversary, Mariner 6 Launch (Mars Flyby Mission)  March 1994   Mar ?? - TC-2C Launch   Mar 05 - 15th Anniversary, Voyager 1 Jupiter flyby   Mar 14 - Albert Einstein's 115th Birthday   Mar 27 - 25th Anniversary, Mariner 7 Launch (Mars Flyby Mission)   Mar 29 - 20th Anniversary, Mariner 10, 1st Mercury Flyby * Mar 31 - Galaxy 1R Delta 2 Launch