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USPS Star Calendar for 30 September-6 October 23 September 2012

Posted by amedalen in October 2012, September 2012.
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1 Oct    Rising less than an hour after sunset, the moon is high in the east mid-evening, with the constellation Aries, the Ram, to its left. Aries’ two brightest stars are magnitude 2.2 Hamal, 4 finger-widths to the moon’s upper left, and magnitude 2.7 Sheratan, which is 2 finger-widths to Hamal’s right.

3 Oct    Look to the west before dawn as magnitude -4.1 Venus passes within 0.15 degrees of magnitude 1.3 Regulus, making it the year’s closest appulse of a planet with a first-magnitude star. Don’t miss this viewing opportunity.

4 Oct    The Pleiades Cluster is 2 finger-widths to the moon’s upper right this morning. After its close approach to Regulus yesterday, Venus begins to retrograde (move westward) and falls away quickly during the coming weeks.

5 Oct    High in the southwest before dawn, magnitude -2.6 Jupiter is 2 finger-widths to the moon’s upper left, and magnitude 1.1 Aldebaran is the same distance to the lower left. Orion is nearly 2 fist-widths to the lower left. The moon is at apogee, 63.53 Earth-radii (405,000 kilometers) away.

6 Oct    Before first light high in the south, Jupiter is less than 4 finger-widths to the waning gibbous moon’s lower right, and Aldebaran is the same distance below Jupiter. Magnitude 0.6 Betelgeuse, Orion’s brightest star, is 1½ fist-widths to the moon’s lower left.

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