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1
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Mercury at greatest elongation, 27° east of the Sun. Skywatchers at mid-northern latitudes may just catch a glimpse of Mercury (magnitude +0.2) about 30 minutes after sunset very, very low in the west-southwest (right of Venus). Binoculars required.
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1
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Venus near Spica. Low in west-southwest sky after sunset. Magnitudes are 4.4 and +1.0, respectively.
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4
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Jupiter 4° from crescent Moon at 15 UT. Best time for skywatchers in North America is 1 hour before sunrise on September 4.
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4
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Jupiter 1.2° from Beehive Cluster (M44) at 16h UT. Visible in the morning sky. Best seen with the aid of binoculars.
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7
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New Moon at 3:10 UT. Beginning of lunation 986.
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8
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Moon at perigee (closest to Earth) at 3h UT (distance 358,746 km; angular size 33.3').
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10
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Venus 7.3° from crescent Moon at 7h UT. Visible at dusk from North America on September 9.
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13
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First Quarter Moon at 18:08 UT.
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21
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Mars at aphelion (furthest from Sun) at 1h UT (distance 1.6661 AU).
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21
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Full Moon at 13:59 UT. The full Moon of September is called the "Fruit Moon" in old almanacs. This year, because this is the Full Moon nearest to the September equinox, it is more commonly known as the Harvest Moon.
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23
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Moon at apogee (furthest from Earth) at 3h UT (distance 406,352 km; angular size 29.4').
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23
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September equinox at 4:55 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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29
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Last Quarter Moon at 17:03 UT.
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Also...
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Saturn remains an early-morning object rising about 1 am. It shines with a distinct yellow color and is located about mid-way between the bright stars Aldebaran and the Pollux-Castor pair. Jupiter rises about 3 hours after Saturn and shines brighter (magnitude 1.8 compared to +0.1). It is located between the Pollux-Castor pair and the bright star Regulus. Mars rises about 1 hour before the Sun and is as faint as it ever gets (magnitude +1.8).
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