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Rasalhague (Alpha Ophiuchi) turns the Summer Triangle into a cut diamond.

This Week's Sky At a Glance

This Week's Sky at a Glance, July 19 – 28

Scorpius poses at center stage in the south. The Sagittarius Teapot follows behind it. And Rasalhague, the head star of Ophiuchus. turns the Summer Triangle into a big, upright diamond.

Regulus and Mercury in twilight, July 12, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, July 12 – 21

Mercury lurks in the sunset. The July Moon rides low across the sky this week as it waxes from first quarter to full. It occults springlike Spica, then passes summery Antares to hang with the Teapot.

Moon passing Regulus, July 7-9, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, July 4 – 14

The waxing Moon passes Regulus on its way to occulting Spica July 13th. The Kite of Boötes tilts toward the Dipper. And the largest asteroid is at opposition.

Spica occultation map

Explore the Night with Bob King

Catch an Exciting Spica Occultation on July 13th

Don't miss Spica's dramatic disappearance at the Moon's dark limb. We also check in on the status of current bright comets.

This Week's Sky At a Glance

This Week's Sky at a Glance, June 28 – July 7

It takes hardly more than a glance up these evenings to check for the anticipated eruption of T Coronae Borealis, the Blaze Star.

T CrB map

Explore the Night with Bob King

Is the "Blaze Star" About to Blow? You May Be the First to Know

T Coronae Borealis is a nova star that's due to suddenly — and briefly — brighten. Here's how to see this once-in-a-lifetime event.

Jupiter barely emerging in bright dawn, June 22, 2024

Celestial News & Events

This Week's Sky at a Glance, June 21 – 30

The two brightest stars of summer balance across the zenith. Arcturus and Vega represent the two commonest spectral types, and colors, of all the naked-eye stars in the sky.

Planet parade

Celestial News & Events

See the Real Planet Parade

Maximize your planetary pleasure and get re-acquainted with Earth's siblings during the June 29th dawn planet parade.

Moon crossing Scorpius, June 18-20, 2024.

This Week's Sky At a Glance

This Week's Sky at a Glance, June 14 – 23

On solstice week the brightening Moon moves across the evening sky from Spica to Scorpius. On Monday, it helps you find a piece of Centaurus from as far north as southernmost Canada!

Crescent Moon under Castor and Pollux, June 7-8, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, June 7 – 16

The waxing Moon reenters the sky as an evening crescent. Pollux and Castor keep it company. The Big Dipper hangs straight down. And can you still catch wintry Capella? The colder your latitude the better your chance.

Big Dipper with the stars labeled with the years the light we see in 2024 left them. (Image: IAU/ Arya Anthony)

This Week's Sky At a Glance

This Week's Sky at a Glance, May 31 – June 9

Arcturus and Vega highlight the evening, The Big Dipper quickly pivots. And sorry, tell your friends and family who ask that no "dazzling Parade of Planets" is blazing across the sky. Who makes this stuff up??

Moon and Saturn, May 31, 2024

Celestial News & Events

This Week's Sky at a Glance, May 24 – June 2

The Big Dipper twists around fast near the zenith, Arcturus almost claims the zenith, the Coma Star Cluster not far away can't quite hide, and T Cor Bor simmers ominously dim.

Aldebaran about to be occulted by the waning gibbous Moon in daylight, Oct. 2, 2015

This Week's Sky At a Glance

This Week's Sky at a Glance, May 17 – 26

This week the Moon occults Beta Virginis, then Antares. The last star of the Summer Triangle finally rises before bedtime. On the other side of the sky, the Arch of Spring sinks low.

Aurora prequel

Celestial News & Events

Severe Geogmagnetic Storm Has Arrived! Auroral Blast Expected Friday Night

A severe geomagnetic storm has just hit Earth — which means we could see auroras tonight! Here's what you'll need to know.

Moon, Capella, and Beta Tauri at dusk, May 10, 2024

Celestial News & Events

This Week's Sky at a Glance, May 10 – 19

The waxing Moon this week travels eastward from the horns of Taurus past the heads of Gemini, the Beehive in Cancer, then the forefoot of Leo on its way to occulting Beta Virginis.

Comet C/2023 A3 early May

Explore the Night with Bob King

Comet Tsuchinshan-ATLAS Brightens, Grows a Tail

Are you excited about Comet Tsuchinshan-ATLAS's prospects for a bright appearance this autumn? Guess what? It's already gorgeous.

Waning Moon passing Saturn and Mars in the dawn, May 4-5, 2024

Celestial News & Events

This Week's Sky at a Glance, May 3 – 12

This week in the moonless dark, the Summer Triangle appears over the eastern treetops star by star. Leo walks down toward the west. And the Sombrero Galaxy positions itself ideally on the south meridian for your telescope.

Eta Aquariids from Australia

Explore the Night with Bob King

Ready the Hot Cocoa and Recliner — Here Comes the Eta Aquariid Meteor Shower!

You might be tempted to sleep through this annual shower but then you'd miss seeing some of the fastest meteors around. Not to mention their parent is the most famous comet of all.

Mars and Saturn low in the dawn around April 27, 2024

Celestial News & Events

This Week's Sky at a Glance, April 26 – May 5

All the planets now huddle around our line of sight toward the Sun. However, these moonless evenings present us the Spring Triangle, the Great Diamond with a sugar sprinkle on its edge, and the Pointers aligned vertically.

Moon meets Spica as Corvus watches, April 22, 2024

This Week's Sky At a Glance

This Week's Sky at a Glance, April 19 – 28

Springtime Leo walks high in the south, springtime Hydra snakes a quarter of the way around the celestial sphere, and the bright Moon aligns with Spica.

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