This animation displays the M45 star cluster as it slowly passes behind the Moon. The approximately 40 shots were taken at 5 minute intervals with the Moon as a reference point. In one of the initial shots, an airplane flew in front of the Moon.
Canon EOS DIGITAL REBEL XTi, Skywatcher ED 80, 18/7/2009 2:57:49 - 6:11:44, Shutter Speed 10 sec to 1/60 sec, Aperture Value 7.5, ISO 400 to 100