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USPS Star Calendar for 13-19 January 6 January 2013

Posted by amedalen in January 2013.
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13 Jan    Magnitude 1.2 Mars is less than 1 fist-width below the thin waxing crescent moon low in the west at dusk. About 5 percent of the moon’s surface is illuminated.

14 Jan   Today is 1 Jan. in the Julian calendar, which was used until 1582 when it was replaced with the Gregorian calendar. This is the first day of the Roman year 2766 AUC. AUC stands for ab urbe condita, which means “from the founding of the city (Rome).”

15 Jan    You will need binoculars to see a group of fourth- and fifth-magnitude stars that forms a pentagon directly above the moon tonight. Part of the constellation Pisces, the stars are within 3 finger-widths of the moon. The brightest, magnitude 3.9 gamma Piscium, is a little more than 1 finger-width to the moon’s upper right.

16 Jan    Pegasus stands to the right of the moon this evening.

18 Jan    The two stars 1 fist-width above the first-quarter moon are magnitude 2.7 Sheratan and magnitude 2.2 Hamal in the constellation Aries, the Ram. Using binoculars, can you spot the fifth-magnitude star just below Sheratan? How about the one to Hamal’s lower right?

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