Mimosa, 2nd-brightest in Southern Cross

To see Mimosa, you need to be at the latitude of New Orleans, Hawaii, Cairo or New Delhi. From the Southern Hemisphere, Mimosa is a prominent and beloved star.

Cancer? Here’s your constellation

Here’s how to find the constellation Cancer in your sky. Plus Cancer’s place in sky history, lore and science.

Come to know the Big and Little Dippers

The Big Dipper is easy. And, once you find it, you can find the Little Dipper, too.

Mizar and Alcor, famous double star

Mizar and its fainter companion star Alcor are easy to spot in the Big Dipper’s handle.

Watch the sun’s shift on your horizon

Looking for an easy, but profound, sky activity? Note how far the sunset moves on your horizon, as spring shifts toward summer, or autumn toward winter, on your part of the globe.

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.