Mon 23 Feb 12:00 AM Jupiter's moons Io, Europa, and Callisto form a very compact group. Mon 23 Feb 4:00 PM The Moon is 2.7° south-southeast of Venus. Tue 24 Feb 4:00 PM Mars, at heliocentric longitude 80.2°, and Pluto, at heliocentric longitude 260.2°, are at heliocentric opposition. Wed 25 Feb 6:15 PM The Moon is at the ascending node at equatorial longitude 43.5°. Wed 25 Feb 8:00 PM The Moon is 0.84° south-southeast of Mars. Thu 26 Feb 7:00 AM Mercury, at equatorial latitude -7.0°, reaches its farthest point south of the ecliptic. Thu 26 Feb 11:00 PM Minimum lunar libration of 2.2°. Fri 27 Feb 12:00 AM Mercury is 1.3° south-southeast of Uranus. Fri 27 Feb 4:00 AM The Moon is 2.6° south-southeast of open star cluster M45 (the Pleiades). Fri 27 Feb 9:24 PM First Quarter Moon. Sat 28 Feb 5:00 AM The Moon is at apogee, subtending 29' 33" at a distance of 404,259 km (251,194 miles). Sat 28 Feb   Jupiter passes 5' south of 4th magnitude star χ (Chi) Leonis. Sun 29 Feb   Leap day. Our trip around the Sun takes 365.26 days, but we round it off to 365 days. In four years time that extra 0.26 days adds up to more than an entire day, so in order to keep the seasons in sync with the calandar we add that day to February. However, we end up with a little bit left over, so years divisible by 100 (1700, 1800, 1900, etc.) are not leap years. That doesn't work out exactly either, so years divisible by 400 (1600, 2000, 2400, etc.) are leap years. This system will work until about the year 5000, when the minor errors will have added up to another full day. This will have to taken care of either by having an extra leap year or a February 30th.