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3
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Moon near Antares (mag. +1.03, brightest star in the constellation Scorpius) at 12h UT (89° from Sun, evening sky).
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3
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First Quarter Moon at 12:34 UT.
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9
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Moon near Mars at 12h UT (evening sky). Skywatchers throughout Asia will witness the rare and beautiful sight of an unusually bright Mars (mag. 2.7) very near the Moon. Skywatchers in some parts of China and Siberia will see a rare and spectacular occultation of Mars by the Moon.
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10
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Full Moon at 16:36 UT. The full Moon of September is called the "Fruit Moon" in old almanacs. As this is also the Full Moon nearest to the September equinox (this year), it is also called the "Harvest Moon".
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11
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Mercury at inferior conjunction at 2h UT (not visible). The planet passes into the morning sky.
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16
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Moon at apogee (furthest from Earth) at 9h UT (distance 404,714 km; angular size 29.5').
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16
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Moon near the Pleiades at 16h UT (morning sky).
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18
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Last Quarter Moon at 19:03 UT.
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20
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Moon near Saturn at 3h UT (morning sky).
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22
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Moon near the Beehive cluster (M44) at 3h UT (morning sky). Binoculars provide a splendid view.
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23
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September equinox at 10:48 UT. The time when the Sun reaches the point along the ecliptic where it crosses into the southern celestial hemisphere marking the start of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
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24
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Moon near Jupiter at 6h UT (25° from Sun, morning sky).
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24
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Moon near Mercury at 20h UT (18° from Sun, morning sky).
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26
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New Moon at 3:09 UT. Beginning of lunation 999.
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27
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Mercury at greatest elongation, 17.9° west of Sun (morning sky). For skywatchers at mid-northern latitudes this is a good apparition of Mercury as the elongation is near vertical. From the horizon up, Mercury (mag. 0.5), brighter Jupiter (mag. 1.7), and Regulus (mag. +1.34) form a straight line.
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28
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Moon at perigee (closest to Earth) at 6h UT (distance 362,834 km; angular size 32.9').
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30
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Moon near Antares at 18h UT (63° from Sun, evening sky).
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All times Universal Time (UT). (USA Eastern Summer Time = UT 4 hours)
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