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USPS Star Calendar for 21-27 October 14 October 2012

Posted by amedalen in October 2012.
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21 Oct    At evening twilight, magnitude 0.9 Altair, in the Summer Triangle, is 2½ fist-widths above the waxing gibbous moon low in the south. The triangle’s other stars are magnitude 0.1 Vega, 3 fist-widths to Altair’s upper right, and magnitude 1.3 Deneb, 2 fist-widths to Vega’s upper left or nearly overhead.

22 Oct    In the south at sunset, magnitude 0.9 Altair—in the constellation Aquila, the Eagle—is 2½ fist-widths to the first-quarter moon’s upper right. In Greek mythology, the eagle Aquila carried Zeus’ thunderbolts.

23 Oct    High in the south at sunset, the waxing crescent moon lies between two third-magnitude stars, so get out your binoculars. Magnitude 3.1 Sadalsuud in Aquarius, the Water Bearer, is 2 finger-widths above the moon, and magnitude 3.0 Deneb Algedi—in the constellation Capricornus, the Sea Goat—is little more than 3 finger-widths below the moon.

25 Oct    Saturn, in conjunction with the sun, passes behind it.

26 Oct    Mercury reaches its greatest elongation east, 24.1 degrees from the sun. Look quickly at dusk to spy Mercury before it slips below the western horizon.

27 Oct    Rising less than an hour before sunset, the nearly full moon is high in the east as the stars appear. Directly above the moon, the Great Square of Pegasus includes three stars from the constellation Pegasus and one borrowed from neighboring Andromeda. The nearest star of the square is magnitude 2.9 Algenib, 1 fist-width above the moon. Magnitude 2.6 Markab is 1½ fist-widths to the upper right, and magnitude 2.6 Scheat is 1½ fist-widths to the upper left. Andromeda’s magnitude 2.1 Alpheratz, 1½ fist-widths to the lower left, completes the square.

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