March (continued)
- Mar 15-19 - 14th North American Workshop on Cataclysmic Variables and Related Objects, Tucson, Arizona
- Mar 16 - Asteroid 36800 Katarinawitt Closest Approach To Earth (1.492 AU)
- Mar 19 - Asteroid 9954 Brachiosaurus Closest Approach To Earth (1.961 AU)
- Mar 20 - Vernal Equinox,11:44 UT
- Mar 20 - Comet C/2008 T2 (Cardinal)Closest Approach TO Earth (1.727 AU)
- Mar 20 - Asteroid 10792 Ecuador Closest Approach To Earth (2.320 AU)
- Mar 23 - Asteroid 2008 WN2 Near-Earth Flyby (0.049 AU)
- Mar 23 - Pierre Simon Laplace's 260th Birthday (1749)
- Mar 23-26 - Ground System Architectures Workshop 2009, Torrence, California
- Mar 23-26 - Annual Conference of the Deutsche Geophysikalische Gesellschaft, Kiel, Germany
- Mar 23-27 - 40th Lunar and Planetary Science Conference (LPSC 2009), The Woodlands, Texas
- Mar 24 - Soyuz TMA-14 Soyuz FG Launch (International Space Station 18S)
- Mar 24 - GPS 2RM F-7Delta 2 Launch
- Mar 24 - Cassini, Orbital Trim Maneuver #184 (OTM-184)
- Mar 24-27 - Conference: Reionization@Ringberg - The Cosmic Evolution of Helium and Hydrogen, Ringberg Castle, Germany
- Mar 25-27 - 27th Inter-Agency Space Debris Coordination Committee (IADC), Darmstadt, Germany
- Mar 25-29 - 1st Annual Hodges Gardens Star Party, Florien, Lousiana
- Mar 26 - Asteroid 7958 Leakey Closest Approach To Earth (1.029 AU)
- Mar 26-27 - Workshop: Beyond JWST - The Next Steps in UV-Optical-NIR Space Astronomy, Baltimore, Maryland
- Mar 27 - Cassini, Titan Flyby
- Mar 27 - Asteroid 2866 Hardy Closest Approach To Earth (2.460 AU)
- Mar 27 - 40th Anniverary (1969), Mariner 7 Launch (Mars Flyby Mission)
- Mar 28 - Asteroid 2002 VX91 Near-Earth Flyby (0.065 AU)
- Mar 28-29 - 2009 All Arizona Messier Marathon, Arizona City, Arizona
- Mar 29 - Daylight Saving - Set Clock Ahead 1 Hour (Europe)
- Mar 29 - Cassini, Orbital Trim Maneuver #186 (OTM-186)
- Mar 29 - Asteroid 18458 Caesar Closest Approach To Earth (1.016 AU)
- Mar 29 - 40th Anniversary (1974), Mariner 10, 1st Mercury Flyby
- Mar 30 - Asteroid 19383 Rolling Stones Closest Approach To Earth (1.582 AU)
- Mar 30-Apr 01 - ESA Workshop on Aerospace EMC, Florence, Italy
- Mar 30-Apr 02 - 5th European Conference on Space Debris, Darmstadt, Germany
- Mar 31 - Hylas Falcon 9 Launch
- Mar 31 - Asteroid 3783 Morris Closest Approach To Earth (1.521 AU)
- Mar 31 - Asteroid 7336 Saunders Closest Approach To Earth (2.355 AU)
- Mar 31-Apr 03 - 6th European WS on Thermal Protection Systems & Hot Structures, Stuttgart, Germany
