61–80 of 2,078 results
Naked eye sunspots

Explore the Night with Bob King

How to Observe and Measure Naked-eye Sunspots

As Solar Cycle 25 ticks up, naked-eye sunspots are becoming more frequent. They're not only fun to observe, but with this simple method you can determine just how big they are. We also have news on a bright supernova!

Moon, Mars, Saturn, Venus. Jupiter, April 25-27, 2022

Celestial News & Events

This Week's Sky at a Glance, April 22 – 30

Arcturus, Spica, and Corvus put on their spring show. The Pointers point straight down at nightfall, which means Leo walks the high south and the Arch of Spring spans the west.

Bright Lyrid

Explore the Night with Bob King

Celebrate Spring with the Lyrids

People have been watching the annual Lyrid meteor shower for more than 2,700 years. Come join the crowd!

Celestial News & Events

Plan Now for the 2023 Solar Eclipse in Western Australia

Here's what to know if you want to see this hybrid (mostly total) solar eclipse next year.

Four planets at dawn: Venus, Mars, Saturn, Jupiter, April 16, 2022

Celestial News & Events

This Week's Sky at a Glance, April 15 – 23

Orion descends, Leo walks sideways, the Dog Stars stand up straight, the Moon wanes past full, and at dawn, Jupiter, Venus, Mars, and Saturn form a diagonal straight line.

Venus, Mars, and Saturn at dawn, April 9, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, April 8 – 16

The gibbous Moon passes through Leo and Virgo as it waxes toward full, forming new Moon-and-stars "lunarisms" (patterns) each evening. Mercury begins a new apparition in the sunset. At dawn, Jupiter emerges to join the lineup of Venus, Mars, and Saturn.


Eclipse Photographer’s Checklist

For those preparing to photograph a total solar eclipse, Fred Espenak shares his eclipse photography checklist.

Halpha sun with prominences


How to Look at the Sun Safely

Our star is an amazing object to observe, whether by eye or with optical aid. These time-tested tips will let you see the solar disk worry-free.

Diamond Ring

Astrophotography: Tips & Techniques

Tips for Photographing a Total Solar Eclipse

A total eclipse of the Sun is a spectacular sight. With a little preparation and advance planning, you can capture your own souvenir portrait of this awe-inspiring sight.

Total solar eclipse 2019 in Chile


Two Years to the 2024 American Total Solar Eclipse!

It’s never too early to start getting excited — and begin planning — for an event as spectacular as a total solar eclipse.

Four planets before dawn April 25-27

Sky Tour Astronomy Podcast

April: Dancing Planets at Dawn

With the arrival of April, you’re likely to spend more time outdoors under the stars. So why not bring along our monthly Sky Tour astronomy podcast? It provides an informative and entertaining 12-minute guided tour of the nighttime sky. Download the April episode to explore the fascinating movement of four planets in the sky before dawn.

Saturn and Mars in dawn conjunction near Venus, April 4 2022with Venus

Celestial News & Events

This Week's Sky at a Glance, April 1 – 9

The evening Moon climbs toward the Arch of Spring, then through it. Orion's Belt levels, the Leaps of the Gazelle cross the zenith, and Saturn and Mars conjoin near brilliant Venus in early dawn.

Comet ATLAS (C/2019 L3)

Explore the Night with Bob King

Comets to View in 2022

Like comets? We've got 11 frozen fuzzies to share with you in the coming months, including a couple that could become fine binocular objects.

Venus, Mars, Saturn and waning Moon, March 27-28, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, March 25 – April 2

What constellation trots behind Sirius and Canis Major across the southern sky? Puppis, not a puppy but the poop deck of Argo Navis. In this dark of the Moon, try for the Clown-Face Nebula high in Gemini. And the three dawn planets dance through two more isosceles triangles.

Canis Minor

Meet the Stars

Meet Procyon, Orion’s Littler Dog

Meet Procyon, the brightest of the few stars in Canis Minor, the Lesser Dog. On its way to becoming a giant, this star is part of the Winter Triangle and Wniter Hexagon asterisms.

Venus, Mars, Saturn at dawn, March 19, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, March 18 – 26

Sirius sparkles on the corner of the Meat Cleaver, two open clusters hide under the Cleaver's handle, Orion's Belt levels out for the turning of spring, and Venus, Mars and Saturn slow-dance at dawn.

Saturn 2011 Cassini

Explore the Night with Bob King

Will Saturn Sprout Spots this Observing Season?

As Saturn returns to the morning sky, will this otherwise serene-looking planet experience another bout of severe weather? Keep your eyes peeled for white spots!

Moon crossing Gemini, March 11-13, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, March 11 – 19

Sirius, bright dogtag of Canis Major, offers observing challenges day and night. The Big Dipper balances Cassiopeia, and the nearly full Moon occults a Leo star.

Moon passing Aldebaran and the Pleiades, March 8-9, 2022

This Week's Sky At a Glance

This Week's Sky at a Glance, March 4 – 12

Evenings see the crescent Moon return, Sirius at its peak in the south, and the Dipper and Cassiopeia in balance toward the north. For planets, look to the dawn.

Shackleton Crater

Night Sky Sights

Meet Shackleton Crater: Future Moon Landing Site

Shackleton Crater at the lunar south pole is a site of future exploration — and you can even see it through your telescope during favorable librations.