Star calendar for September 2015

Star calendar 1–30 September 2015

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

4 Sep    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 Sep    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 Sep    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 Sep    The thin crescent moon is just to the right of Regulus this morning.

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

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

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

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

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

Share this calendar