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In the Sky This Month

The stars of winter are marching toward the end of their annual evening run. Orion is in the southwest at nightfall as April begins, for example, but is quite low in the west as the Sun begins to set by month’s end. Sirius, the Dog Star, trots along behind Orion, with Procyon, the “little dog star,” high above it. And Taurus, the bull, dives face-first toward the western horizon. Venus, the Evening Star, pushes through the constellation during the month.

April 6: Venus and Aldebaran

A brilliant point of light in the evening sky is sweeping past one that’s merely bright. The brilliant light is Venus, the “evening star.” The merely bright light is Aldebaran, the eye of the bull, to the left of Venus and a little higher in the sky.

April 7: Morning Planets

Mars remains in good view in the early morning. It forms the lower left end of a lineup of three planets at first light. Saturn is to the upper right of orange Mars, with brilliant Jupiter farther along the same line.

April 8: Stepping Stone

Polaris, the North Star, marks the north celestial pole. But it is not especially bright, so it can be tough to find. The Big Dipper serves as a pointer. The two stars that mark the outer edge of its bowl point almost directly toward Polaris.

April 9: Auriga

Auriga, the charioteer, drives across the western sky this evening. Its brightest star is yellow-orange Capella, which stands high in the west-northwest as darkness falls.

April 10: Sparse Neighborhood

Our stellar neighborhood is thinly settled. Only 11 stars lie within 10 light-years of the solar system, and only one of them is visible from northern skies: Sirius, the brightest star in the night sky, which is in the southwest in early evening.

April 11: Vela Supernova

A nebula in the constellation Vela spans about 16 times the width of the Moon in our sky – almost as big as your fist at arm’s length. The Vela Supernova Remnant is 800 light-years away. It was born 11,000 years ago, when a supergiant star exploded.

April 12: Galactic Fireworks

NGC 6946 is the source of a lot of fireworks. Over the last century, it’s produced more exploding stars than any other galaxy. The galaxy is high in the northeast before dawn, to the left of Deneb, the bright star at the tail of the swan.

First QuarterFirst Apr. 1, 5:21 am

Full MoonFull Apr. 7, 9:35 pm

Last quarterLast Apr. 14, 5:56 pm

New MoonNew Apr. 22, 9:26 pm

First QuarterFirst Apr. 30, 3:38 pm

Times are U.S. Central Time.

Perigee April 7

Apogee April 20

The full Moon of April is known as the Egg Moon or Grass Moon.