"What Is the Universe Expanding Into?" A reader recently asked that question. So here's the inside scoop.
Moon Question of the Day
What causes the distance from Earth to the Moon to vary?
Moon Folklore of the Day
For better results when spring-cleaning, do the chores during a waning Moon (between full and new...
Featured Astronomy Articles
With the Tide Predictions Calculator, find high and low beach tides for any location in the U.S. and Canada for any date.
Each month, we highlight what's happening in the skies—including bright planets, conjunctions, and meteor showers. Read Sky Watch.
Sky Maps (Star Chart)
Get free, printable Sky Maps (Star Charts) to find your way around the night sky.
View Sky Maps for MAY.
Catch a star! See meteor showers dates for 2015 —plus viewing tips.
Which eclipses are visible where you live? Check the 2015 and 2016 Eclipse Dates.
Find like-minded people and friendly discussion. Click on the links below to read recent topics and to post comments.
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Lunar crescents following new Moon
Thank you for making Bob Berman's excellent article available from the 2011 Old Farmer's Almanac. To find Bob Berman's article. First, under the Astronomy option: Go to Moon...
Angle of the Sun
Hello! I was wondering why the angle of the sun is different in Autumn than in Spring. The Azimuths are the same, but in Autumn the shadows are longer and the light seems...