Weekly Stargazing Tips

Provided by StarDate.org. Unless otherwise specified, viewing times are local time regardless of time zone, and are good for the entire Lower 48 states (and, generally, for Alaska and Hawaii).

December 19: More Moon and Saturn

The bright planet Saturn stands close to the upper right of the Moon at dawn tomorrow. Saturn has more than 60 known moons of its own, including one with hydrocarbon lakes on its surface and another that shoots geyers of water into space.

December 20: Deep Vision

If you gaze long enough into a dark sky, it seems like you can see forever. That’s not quite the case, but you can come close: The most distant object that’s easily visible to the unaided eye, the Andromeda galaxy, is 2.5 million light-years away.

December 21: Winter Solstice

Winter begins in the northern hemisphere this afternoon, as the Sun appears farthest south in our sky for the year. This point is known as the winter solstice, and it brings the shortest day of the year.

December 22: Rigel

Rigel, the brightest star of Orion, the hunter, is low in the east-southeast in early evening, to the right of Orion’s Belt. It is more than 20 times as massive as the Sun, dozens of times larger, and roughly 100,000 times brighter.

December 23: Northern Cross

The stars offer a holiday decoration this evening: the Northern Cross, which is also known as Cygnus, the swan. Its brightest stars form the shape of a crucifix, which stands almost straight up from the northwestern horizon at nightfall.

December 24: Moon and Mars

Mars and the Moon stage a pretty encounter this evening. Mars looks like an orange star close to the left of the Moon. They are low in the southwest at nightfall and set a couple of hours later.

December 25: Moon, Mars, and Venus

Like bulbs on a strand of Christmas lights, three worlds line up in the southwest early this evening. The most prominent is the Moon. Mars stands below and to the right of the Moon, with dazzling Venus far to the lower right of Mars, just above the horizon.