Identify stars in the Winter Circle

Tonight – January 18, 2019 – our chart covers an area of sky wider than we typically show. It’s in answer to a reader in Nashville, who wrote:

I’ve heard mention of the Winter Circle of stars. Could you list the stars in this circle?

We can do better than that. We can advise you to go outside on this date, and look for the waxing gibbous moon, then notice the stars nearby. The moon is within the Winter Circle stars on this date. All the stars of the Winter Circle (sometimes called the Winter Hexagon) are first-magnitude stars, so they should be able to withstand tonight’s drenching moonlight.

The Winter Circle stars don’t form a perfect circle … is anything ever perfect? Try starting at Capella and moving clockwise to Aldebaran, Rigel, Sirius, Procyon, Pollux, and Castor.

This pattern of stars is not a constellation. It’s a lot of separate stars in different constellations. In other words, it’s what’s called an asterism. From our Northern Hemisphere locations, these same bright stars can be seen before dawn every late summer and early fall. And they can be seen in the evening every winter. Hence the name Winter Circle.

I wonder what these same stars are called in the Southern Hemisphere? They’re visible from there, but of course it’s summer there now. I don’t know if this particular collection of bright stars has some special name as seen from that part of the globe. If any of you do know … tell us in the comments!

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Night sky.

View larger. | The Winter Circle as photographed by EarthSky Facebook friend Zhean Peter Nacionales in the Philippines. Thank you, Zhean!

Bottom line: The stars of the Winter Circle may be seen on these cold winter nights until well after midnight. On January 18, 2019, the moon is inside the Winter Circle.

Read more about the Winter Circle: Brightest winter stars

Live by the moon with your 2019 EarthSky lunar calendar!