How many supermoons in 2019?

We’ll have a series of 3 full supermoons on January 21, February 19 and March 21, 2019. Of these, the February 19 full moon will be the closest and largest full supermoon of 2019.

New Year's Eve fireworks in Singapore 2019.

Why the New Year begins on January 1

Celebrating the New Year on January 1 is a civil event, not an astronomical one. And yet nature cooperates to make January 1 a satisfying time to start anew.

EarthSky’s most popular photos of 2018

Wow! Huge thanks to the EarthSky community for all the images you’ve contributed this year. Here are some of 2018’s most popular photos.

Is time travel possible?

Sure it is, says this physicist, but only if you have an object with infinite mass. Here’s the story of how to build a time machine, with a design that’s deceptively simple.

50th anniversary of 1st Earthrise photo from moon

A video visualization of events leading to one of the best-known photographs of the 20th century – Earth rising over the moon – as seen by Apollo 8 astronauts 50 years ago.

What are your chances for a white Christmas?

For people in the continental United States, here’s your historic probability of getting a white Christmas in 2018.

Was the Christmas Star real?

Are there any possible astronomical explanations for the Star of Bethlehem or Christmas star?

What would a warmer world look like?

According to the recent IPCC Special Report, warming of 1.5°C (2.7°F) is an important threshold for many climate impacts. What might our planet look like with 1.5°C of warming?

Christmas Bird Count starts December 14

Audubon’s annual Christmas Bird Count is one of the longest-running citizen science projects in existence. How to participate.

Prehistoric cave art suggests ancient use of complex astronomy

As far back as 40,000 years ago, cave-dwellers in what’s now Turkey, Spain, France and Germany all used a method of date-keeping based on the stars. Some of their cave paintings aren’t just depictions of wild animals; instead they represent constellations in the night sky.