Enjoying EarthSky? Subscribe.

102,855 subscribers and counting ...

Astronomy Essentials

Groundhog Day
Tonight | Feb 02, 2014

Everything you need to know: Groundhog Day

Groundhog Day comes every year on February 2. It has its roots in astronomy, in the sense that it’s a seasonal festival, tied to the movement of Earth around the sun.

Jupiter's Great Red Spot
Tonight | Jan 12, 2014

Best time to see Jupiter in 2014 is now

Jupiter is always closest around the time of its yearly opposition, which came on January 5, 2014. For the rest of this month, Jupiter is at its best!

Lyrid April 22, 2013 via Mike O'Neal
Tonight | Jan 10, 2014

EarthSky’s meteor shower guide for 2014

The Lyrid meteor shower in late April is next!

Hoax image via social media.
Tonight | Jan 02, 2014

Double moon on August 27?

Will Mars and the moon will appear the same size on August 27, 2014? Nope.

Quadrans Muralis via Atlas Coelestis.
Tonight | Jan 02, 2014

Everything you need to know: Quadrantid meteor shower

The 2014 Quadrantid meteor shower is likely to be at its best before dawn on January 3 for North America, and before dawn on January 4 in Asia.

Supermoon-cp
Dec 29, 2013

Does a supermoon have a super effect on us?

A supermoon’s effects are imperceptible, far smaller than those encountered in other everyday situations, such as being near a mountain or even a large building.

Credit: Russell Croman
Tonight | Dec 24, 2013

Was the Christmas Star real?

A wondrous star has grown to be a major symbol of Christmas around the world. But what was it, really?

December solstice
Blogs | Tonight | Dec 20, 2013

Everything you need to know: December solstice 2013

The December solstice marks the longest night in Northern Hemisphere and longest day in the Southern Hemisphere. Celebration time!

ursid-radiant-point-cp
Tonight | Dec 19, 2013

Ursid meteors active around December solstice

As many as 100 Ursid meteors per hour have been seen – but only in short bursts. Expect 5 to 10 meteors per hour.

The Geminid meteors radiate from near star Castor in Gemini.
Blogs | Tonight | Dec 10, 2013

Radiant point for December’s Geminid meteor shower

The December Geminid meteor shower radiates from the constellation Gemini – in the east in mid-evening or overhead by about 2 a.m.