Arcturus, brightest star of the north

Arcturus is the 4th brightest star in the sky and the brightest star north of the celestial equator. One of the easiest stars to locate due to its position off the handle of the Big Dipper, you can look for it on spring evenings in the Northern Hemisphere.

Best mornings for Eta Aquariid meteors likely May 5 and 6

In 2021, the forecast calls for the greatest number of Eta Aquariid meteors to fall before dawn on May 5. If you're clouded out, try the morning of May 6.

What is a supermoon?

A "season" of 3 full moon supermoons will be coming on April 27, May 26 and June 24, 2021, with the May 26 full moon counting as the year's biggest supermoon. Supermoon-o-mania, here.

When is the next tide? Recommended almanacs here

The EarthSky-recommended tide almanacs listed here are based on astronomical influences on the tides. They'll help you in finding the next high and low tides.

What are Lunar X and Lunar V?

Is Lunar X a sign of an alien visitation? No. It's an example of how lighting and topography can combine to produce a pattern that seems familiar to the human eye.

2021 Lyrid meteor shower: All you need to know

The Lyrids are an Earth Day meteor shower, peaking on the morning of April 22. Also, try the next morning, April 23. The moon is waxing - staying out longer after dark each night - so you'll want to watch the time of moonset carefully.

Dates of lunar and solar eclipses in 2021

Here are the dates of all solar and lunar eclipses in the year 2021. Is there one you can see? The next one is a total lunar eclipse, coming up in May.

How to take photos of star trails

Photographers take star trail photos by pointing their cameras at the sky and leaving the shutter open for long exposures, resulting in an image that shows streaks of light from the movement of Earth's rotation.

Beta Centauri is a Southern Pointer Star

Beta Centauri isn’t as famous as Alpha Centauri, but together, these brilliant Southern Hemisphere stars have inspired legends and guided mariners.

The Coma Cluster contains thousands of galaxies

Myriads of galaxies, visible only to those with medium-to-large telescopes, shine among the stars in the "Realm of the Galaxies." Study of the Coma Cluster of galaxies aided in the discovery of dark matter.