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Uranus at opposition on November 25, 2026

Don't miss Uranus at opposition on November 25, 2026. At this time, it's brightest for the year and visible to the eye under optimum observing conditions.

Deborah Byrd

January 1, 2026

How to know your eclipse glasses are safe

Unscrupulous companies are printing ISO certification labels on fake eclipse glasses. Check here for reputable vendors from the American Astronomical Society.

Deborah Byrd

January 1, 2026

New Year’s Star Sirius, the moon and Jupiter ring in 2026

Entertain your friends on New Year's Eve by showing them the New Year's Star, the soon-to-be full supermoon and Jupiter. Sirius is highest at midnight.

Editors of EarthSky

December 31, 2025

Why are stars so bright on winter nights?

In December, January and February, we look away from the Milky Way's cloudy core toward the Orion spiral arm, with stars so bright they capture our attention.

Deborah Byrd

December 26, 2025

What was the Christmas star? Science and mystery

What was the Christmas star? Some scientific explanations attempt to explain the Star of Bethlehem, including a planetary conjunction, comet or supernova.

Larry Sessions

Deborah Byrd

December 21, 2025

December has the longest days (wherever you live)

The longest days accompany the winter solstice. In December, a day - a whole cycle of day and night - is about half a minute longer than the average 24 hours.

Bruce McClure

December 18, 2025

Forms of aurora: Arcs, curtains, coronas and more

Here are some of the forms of aurora that you might see. Some are more common, such as diffuse glows, while others are a sign of a big geomagnetic storm.

Kelly Kizer Whitt

December 14, 2025