Three sun tracks from noon to sunset: summer solstice, equinox, winter solstice.

March equinox: All you need to know

The 2020 equinox comes March 20 at 03:50 UTC. That’s tonight – the night of March 19 – according to clocks in North America. Happy spring (or fall), y’all.

Is Sirius the most luminous star?

It’s the brightest star in Earth’s sky, so spectacularly bright that you might see glints of different colors radiating from it. But is Sirius so bright because it’s an extremely powerful star?

The front of a pair of binoculars.

Top tips for binocular stargazing

Whether you’re a beginning stargazer or a veteran of thousands of starry nights, binoculars can be your best friend.

Why 2020 is an awesome year for Mars

Right now, Mars is in the east before sunup. It’s getting brighter, but is still much fainter than mighty Jupiter, which is near it on the sky’s dome. But just wait. 2020 will be a great year to see Mars! Here’s why.

Are day and night equal at the equinox?

Equinox means “equal night.” And you might hear that day and night are equal at the equinoxes. Yet Earth’s atmosphere and our sun conspire to give us more day than night at an equinox.

What is the gegenschein?

The sun’s counterglow – or gegenschein – is kind of a stargazers’ legend. What is it, and how can you see it? Erwin Matys and Karoline Mrazek of Project Nightflight explain.

It’s time to watch for the zodiacal light

The zodiacal light is an eerie light extending up from the horizon. This is a good time of year to see it in the evening from the Northern Hemisphere. Southern Hemisphere, look before dawn!

Large space rock passing near Earth.

Here’s how to see that huge asteroid that’ll safely pass Earth in April

The huge asteroid known as (52768) 1998 OR2 will pass closest on April 29, 2020. Observers peering through telescopes will see it as a slow-moving “star.” Charts, tips – plus how to watch online – here.

A ball of stars: globular cluster M13

What is a globular cluster?

Globular clusters are spherical collections of up to perhaps a million stars, orbiting mostly in the star halo of spiral galaxies, containing some of a galaxy’s oldest stars.

A basket full of colored Easter eggs.

When is Easter in 2020?

In 2020, Easter Sunday will fall on April 12. How the date of Easter is determined, here.