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USPS Star Calendar for 17-23 March 10 March 2013

Posted by amedalen in March 2013.
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17 Mar    The waxing crescent moon lies between magnitude -2.2 Jupiter, less than 1 finger-width to the upper right, and magnitude 1.1 Aldebaran, less than 2 finger-widths to the lower left.

18 Mar    The moon is midway between magnitude 0.2 Capella, 2½ fist-widths to the upper right, and magnitude 0.3 Rigel, to the lower left. Several other bright first-magnitude stars are nearby tonight: magnitude 0.6 Betelgeuse 1½ fist-widths to the left, magnitude 1.1 Aldebaran 1 fist-width below, magnitude 0.5 Procyon 3½ fist-widths to the upper left.

19 Mar    The first-quarter moon is at apogee, 63.38 earth-radii or 404,000 kilometers away.

20 Mar    The vernal equinox occurs at 1102 UT as the sun crosses the celestial equator, headed north, marking the first day of spring for the northern hemisphere, when day and night are approximately equal all over the world. “Equinox” comes to us from the Latin, meaning “equal night.” The precise date of equal day and night depends on your location, however. If you are at 60 degrees north latitude, day and night are equal on 18 March. If you are between 40 and 55 degrees north latitude, your date is 17 March. Between 30 and 35 degrees, it’s 16 March. The date becomes earlier the closer you are to the equator.

21 Mar    High in the south at dusk, Orion is far to the waxing gibbous moon’s lower right, while the Gemini Twins are to the upper left and Procyon is to the lower left. The Big Dipper stands on its handle high in the northwest.

22 Mar    The moon hangs high in the south as the sky darkens this evening. Procyon is 1 fist-width to the lower left, and the Gemini Twins are the same distance above. Far to the lower left, Regulus is the brightest object in that area of sky.

23 Mar    Rising 3½ hours before sunset, the moon is high in the southeast at dusk. Regulus is 4 finger-widths to the left, and the Big Dipper stands on its handle to the far left. As evening passes, the Big Dipper rotates counter-clockwise and is upside-down, high in the north at midnight.


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