Star Calendar 1-31 July 2015

Star calendar 1–31 July 2015

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1 July   The equation of time is zero. Sun time and local mean time are the same.

4 July   High in the south before dawn, the Pleiades Cluster is 4 finger-widths above or to the upper right of the moon. Aldebaran is the same distance to the left. At its greatest elongation 27.1 degrees east of the sun, Mercury sets nearly an hour after sunset.

5 July   The moon is to Aldebaran’s left this morning, and Orion the Hunter is not far below the moon. Follow a line through his belt 2 fist-widths to the lower left to the Dog Star, Sirius, the brightest star in the night sky. Mars and Venus stand side by side low in the east before dawn. Mars is less than 1 fist-width to Venus’ left.

10 July   The moon slides to the lower left of Venus this morning. Mars is 3 finger-widths to the moon’s left. Regulus and Jupiter line up below Mars.

11 July   The thin crescent moon is just to the right of Regulus this morning.

12 July   The moonless evening gives us a perfect chance to see the Milky Way, which stretches from Scorpius in the south, directly overhead, and past Cassiopeia in the north.

14 July   If you look at dusk, you may catch a glimpse of Mercury to the left of the moon low in the west.

15 July   Spica is to the moon’s lower left, low in the west at dusk.

18 July   Low in the southwest at nightfall, Saturn is 1 finger-width to the moon’s lower left. Scorpius lies just beyond Saturn.

19 July   Saturn is 1 fist-width to the moon’s lower left tonight. Antares, the heart of the Scorpion, is 4 finger-widths below the moon.

21 July   The first-quarter moon is directly above the dome of the Teapot constellation, Sagittarius.

23 July   The autumnal equinox marks the beginning of fall in the Northern Hemisphere. The length of daylight and darkness are approximately equal. Altair is 2½ fist-widths above the moon this evening.

27 July   In North America, the moon is full at 2250 EDT. Perigee occurs less than an hour earlier, resulting in tidal extremes. At only 55.95 Earth-radii (357,000 kilometers) away, this is the closest perigee of the year.

29 July   The Pleiades Cluster is 1 fist-width to the moon’s left tonight.

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