Enjoying EarthSky? Subscribe.

264,644 subscribers and counting ...


Celebrating the Pleiades, or Seven Sisters

Photos from Project Nightflight and others in the EarthSky community of the famous star cluster Pleiades. Look for this tiny, misty dipper in your night sky.

Time to see Mira the Wonderful

Mira, in Cetus the Whale, varies in brightness over about 11 months. In late December 2017, it might be near its peak brightness, easily bright enough to be viewed with the eye alone.

Geminid meteors peak December 12-13

With the meteors’ source – 3200 Phaethon – nearby, 2017 could be a fantastic year for this shower. Peak morning probably Thursday, but watch tomorrow and Friday mornings, too.

Meet the Dog Stars

Dog Star Sirius is our sky’s brightest star. Dog Star Procyon isn’t as bright, but it’s easy to spot. Say howdy to these 2 tonight!

Use Orion’s Belt to find other stars

How to use Orion’s Belt to find 4 bright stars – Betelgeuse and Rigel in Orion – Aldebaran in Taurus the Bull and Sirius in Canis Major.

What would Earth be like with no moon?

Earth without its moon would be a very different world indeed. No eclipses. Smaller tides. But the biggest change would be in the length of Earth’s day.

What’s the birthstone for December?

December has two birthstones, turquoise and zircon.

When is my earliest sunset?

At the latitude of Miami, Florida or Brownsville, Texas in the U.S. – or, say, the city of Naha in Okinawa, Japan – the earliest sunsets of the year are happening now. How earliest sunset varies with latitude, but always comes before the winter solstice.

Astro festivals, star parties, workshops

The wintertime star parties are mostly at southerly latitudes. Time to plan a winter vacation!

A farewell to Saturn

Two days before it plunged into Saturn’s atmosphere last September 15, the Cassini spacecraft returned this final, full mosaic image of the planet.