Equinox sun above horizon all day, at the poles

We know the equinox sun rises due east and sets due west. But what happens at Earth's poles? Turns out the North Pole sun is above the horizon all day long. And it looks exactly the same at the South Pole!

On the equinox, are day and night equal?

Day and night are mostly equal on the equinox. There's a bit more daylight because the sun is a disk, not a point, and Earth’s atmosphere refracts sunlight.

Equinox fun: Track sun’s shift between now and the solstice

On this equinox, start tracking the sunset point on your western horizon. You'll see a mighty shift between now and the June solstice.

Visible planets and night sky guide for March

Visible planets in March 2022. We're 20 days from eclipse day on April 8! Did you know? Eclipses and equinoxes are cousins. Learn more in this video.

Year’s fastest sunsets happen around equinoxes

The year's fastest sunsets are at the equinoxes, and the slowest are at the solstices. We're talking about how long it takes the sun to sink below the horizon.

Color weirdness before April’s total solar eclipse

We're counting down to the April 8, 2024, total solar eclipse, which will cross North America. Colors look eerie just before the moon covers the sun. Why?

March equinox 2024: All you need to know

The 2024 March equinox falls March 20 at 3:06 UTC. So many parts of the world will see the equinox arrive on March 19. Learn about an equinox here.

Supermoons galore in 2024!

What is a supermoon? In 2024, there are 5 new supermoons in a row from January to May, and 4 full supermoons in a row from August to November.

What’s a constellation? What’s an asterism?

Constellations and asterisms are patterns of stars. Some asterisms consist of stars from different constellations, and some are part of one constellation.

Meteor shower guide 2024: Up next the April Lyrids

We're in a meteor shower drought until the April Lyrids. They'll be best overnight on April 21-22. Your 2024 meteor shower guide here.

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