Why Easter falls on this Sunday

In 2024, Easter will fall on March 31. It falls on the first Sunday after the first full moon after the March equinox. More about the date of Easter, here.

Visible planets and night sky guide for March and April

Visible planets for March: On the mornings of March 30 and 31, the moon will lie close to the bright star Antares in Scorpius and will occult it for some viewers.

Total solar eclipse in 10 days! Watch for these key moments

Only 10 days to go to the April 8, 2024, total solar eclipse! Learn how to spot 1st, 2nd, 3rd, and 4th contacts, some easy key moments in the solar eclipse!

See the zodiacal light now, before it’s gone

The zodiacal light is an eerie light extending up from the horizon. During the months around the March equinox is a good time to see it. How to see it, here.

Penumbral lunar eclipse to pass quietly March 24-25, 2024

The 1st of this year's 4 eclipses will flit by like a ghost in the night between March 24 and 25. It's a penumbral lunar eclipse, visible in North America. Charts and more from Guy Ottewell here.

Penumbral lunar eclipse March 24-25, 2024

A penumbral lunar eclipse happens overnight on March 24-25, 2024, bringing a subtle shading to the moon. See where it's visible and more, here.

Dark matter, a mysterious substance … What is it?

What is dark matter? It doesn't emit light. It hasn't been directly observed. Yet it appears to exist and to exert a major influence on galaxies.

Why is there no eclipse every full and new moon?

If the moon orbited Earth on the same plane that Earth circles the sun, we'd have an eclipse at every full and new moon. Here's why we don't.

What is a galaxy? All you need to know about galaxies

What is a galaxy? We live in a galaxy called the Milky Way. But there is so much more to know about these grand and glorious star islands in space!

1st eclipse season of 2024 starts March 24-25

There are many cycles in the heavens. We're coming up to a noticeable cycle, the 1st eclipse season this year. It starts with a penumbral lunar eclipse.