July
- Jul 01 - Mercury At Its Greatest Western Elongation (22 Degrees)
- Jul 03 - Comet C/2006 Q1 (McNaught) Perihelion (2.764 AU)
- Jul 03 - Asteroid 2004 TG10 Near-Earth Flyby (0.061 AU)
- Jul 03 - 10th Anniversary (1998), Nozomi Launch (Japan Mars Mission)
- Jul 04 - Earth At Aphelion (1.017 AU From Sun)
- Jul 04 - Asteroid 2620 Santana Closest Approach To Earth (1.884 AU)
- Jul 04 - Henrietta Leavitt's 140th Birthday (1868)
- Jul 05 - Asteroid 4969 Lawrence Closest Approach To Earth (2.751 AU)
- Jul 06 - Comet C/2007 M1 (McNaught) Closest Approach To Earth (6.613 AU)
- Jul 06 - Asteroid 12760 Maxwell Closest Approach To Earth (1.862 AU)
- Jul 06 - 70th Anniversary (1938), Seth Nicholson's Discovery of Jupiter Moon Lysithea
- Jul 06-11 - Conference: Astronomical Polarimetry 2008 - Science from Small to Large Telescopes, Quebec, Canada
- Jul 07 - Cassini, Distant Flyby of Janus & Pandora
- Jul 07 - Asteroid 64070 NEAT Closest Approach To Earth (1.639 AU)
- Jul 07 - Asteroid 433 Eros Closest Approach To Earth (2.132 AU)
- Jul 07 - 5th Anniversary (2003), Mars Exploration Rover B (Opportunity) Launch
- Jul 07-11 - 4th Heidelberg International Symposium on High Energy Gamma Ray Astronomy, Heidelberg, Germany
- Jul 07-11 - Conference: Protostellar Jets in Context, Rhodes, Greece
- Jul 07-11 - 8th Reunion Cientifica de la Sociedad Espanola de Astronomia, Santander, Spain
- Jul 08 - Asteroid 2906 Caltech Closest Approach To Earth (2.150 AU)
- Jul 08-10 - Eufoam Conference, Noordwijk, The Netherlands
- Jul 09 - Jupiter At Opposition
- Jul 09-11 - Workshop: Radio Galaxies in the Chandra Era, Cambridge, Massachusetts
- Jul 10 - Asteroid 2002 AZ1 Near-Earth Flyby (0.022 AU)
- Jul 10 - Asteroid 2003 RU11 Near-Earth Flyby (0.079 AU)
- Jul 12 - Asteroid 2001 SZ269 Near-Mars Flyby (0.037 AU)
- Jul 12 - 20th Anniversary (1988), Phobos 2 Launch (Soviet Mars Orbiter)
- Jul 13 - Asteroid 90403 (2003 YE45) Near-Earth Flyby (0.042 AU)
- Jul 13-18 - 10th Annual Asteroids, Comets, Meteors Meeting, Baltimore, Maryland
- Jul 13-20 - 37th COSPAR Scientific Assembly, Montreal, Canada
- Jul 14 - Cassini, Distant Flyby of Prometheus & Pallene
- Jul 14 - Asteroid 17058 Rocknroll Closest Approach To Earth (1.782 AU)
- Jul 14-18 - Conference: Magnetic Field Generation in Experiments, Geophysics and Astrophysics, Santa Barbara, California
- Jul 15 - IBEX (Interstellar Boundary Explorer) Pegasus XL Launch
- Jul 15 - Asteroid 9951 Tyrannosaurus Closest Approach To Earth (1.114 AU)
- Jul 16 - Space Tracking and Surveillance System (STSS) Demo
- Jul 17 - Asteroid 2005 UR64 Near-Mars Flyby (0.049 AU)
- Jul 17-19 - 12th Paris Cosmology Colloquium 2008: CMB, DM, DE, Dark Ages and LSS in the Standard Model of the Universe, Paris, France
- Jul 18 - Asteroid 1997 UA11 Near-Earth Flyby (0.100 AU)
- Jul 19 - Asteroid 3905 Doppler Closest Approach To Earth (2.024 AU)
- Jul 20 - GOES-O Delta 4 Launch
- Jul 20 - Asteroid 1134 Kepler Closest Approach To Earth (0.830 AU)
- Jul 20 - Asteroid 1566 Icarus Closest Approach To Earth (0.836 AU)
- Jul 20-24 - Australian Earth Sciences Convention 2008, Perth, Australia