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Cloudy partial eclipse

Astronomy and Society

Annular Solar Eclipse Dazzles Watchers Across North America

The weekend's solar eclipse dazzled observers throughout the U.S. and Mexico. Sky & Telescope editors and contributing editors report.

Annular eclipse

Eclipses

Where to Watch the October 14th Annular Solar Eclipse Online

If you can't see the annular solar eclipse in person, we've got some online viewing opportunities for you.

Jupiter and partially eclipsed Io, Oct. 5, 2023.. Sean Walker image.

This Week's Sky At a Glance

This Week's Sky at a Glance, October 13 – 22

The week's big event is the Moon stepping on the Sun on Saturday the 14th. But the Moon's not done. Several days later it steps squarely on the handle of the Sagittarius Teapot, then on Herman's Cross. Show-off. Image: S&T's Sean Walker resolves Io half lit as it slips into Jupiter's shadow.

Annular solar eclipse

Celestial Objects to Observe

When It's Eclipse Decision Time, How Do You Decide Where to Go?

Satellite imagery will prove invaluable in making decisions on the day of the annular solar eclipse.

Comet 12P/Pons-Brooks outburst

Comets

Comet 12P/Pons-Brooks (aka the "Millenium Falcon" Comet) Flares Again!

Comet 12P/Pons-Brooks has awakened again from its recent slumbers with a fresh outburst. It's now bright enough to see in a modest telescope.

Baily's beads

Eclipses

The History of Baily’s Brilliant Beads

Discover the observations of astronomer Francis Baily as he watched sunlight bead along the lunar limb during an 1836 annular eclipse.

Moon, Venus and Regulus at dawn, Oct. 10, 2023

Celestial News & Events

This Week's Sky at a Glance, October 6 – 15

A partial/annular eclipse of the Sun washes across the Americas on Saturday the 14th. Four days before, the waning Moon and Venus pair up in early dawn with Regulus glimmering between them.

Comet 103P/Hartley diffuse appearance

Explore the Night with Bob King

Comet Hartley Comes Home Again; Gegenschein-gazing

Get acquainted with Comet 103P/Hartley. It's been a dozen years since its last bright apparition. While you're at it challenge yourself to spot the elusive gegenschein.

Moon with Jupiter and the Pleiades, Oct 1 and 2, 2023

Celestial News & Events

This Week's Sky at a Glance, September 29 – October 8

The Moon pairs with Jupiter, then the Pleiades, as it departs the evening sky. That leaves a dark-sky Milky Way crossing the zenith, where Cygnus the Milky Way Swan flies southward for fall.

Moon passing under Saturn in evening, Sept. 26-28, 2023

Celestial News & Events

This Week's Sky at a Glance, September 22 – October 1

The bright Moon steps eastwaed night by night under Altair, then Saturn, then the Great Square of Pegasus. Meanwhile, Deneb replaces Vega as the zenith star; welcome to fall.

Flattened Sun

Celestial News & Events

Is the Day 12 Hours Long on the Equinox? It's Complicated

The Earth's atmosphere and the large size of the solar disk result in unequal days and nights, even on the equinox.

Venus, Regulus, and Mercury in early dawn, Sept 16, 2023

Celestial News & Events

This Week's Sky at a Glance, September 15 – 24

Comet Nishimura shines at its brightest... but don't be disappointed, we warned you. Meanwhile Jupiter outdoes Saturn as an evening light, and the Little Dipper dumps water into the Big Dipper.

Waning crescent Moon passing Venus at dawn, Sept 11-12, 2023Moon

This Week's Sky At a Glance

This Week's Sky at a Glance, September 8 – 17

Comet Nishimura teases us shyly low on the dawn horizon, then low on the dusk horizon. The Milky Way arches high across the evening sky, and Saturn invites your telescope.

Waning Moon and Jupiter around midnight, Sept 3-4, 2023

This Week's Sky At a Glance

This Week's Sky at a Glance, September 1 – 10

Vega culminates at the zenith around the end of twilight. Arcturus and the Dipper sink through the evening. Saturn and Jupiter rule the late-night hours, and Venus shines at dawn.

History and Sky Lore

The Moon Is "Blue" This Wednesday...Or Is It?

If skies are clear this Wednesday, you'll see the full Moon — but it's not the "true" Blue Moon.

Full Moon and Saturn at opposition, Aug. 30, 2023

This Week's Sky At a Glance

This Week's Sky at a Glance, August 25 – September 3

Saturn comes to opposition. Vega crests at the zenith, while Arcturus declines in the west. Venus shines at dawn. Go out before dawn's very first light, and you get an Orion-starring preview of the evening sky at New Year's.

Comet Nishimura C/2023 P1

Celestial News & Events

New Comet Nishimura May Become Naked-Eye Bright

Comet Nishimura is quickly brightening in the morning sky and may be faintly visible with the naked eye next month. And on August 24th observers in North America will be treated to an occultation of Antares.

Moon passing Spica at dusk, Aug 9-21, 2023

This Week's Sky At a Glance

This Week's Sky at a Glance, August 18 – 27

The waxing Moon passes Spica and then will occult Antares for much of North America. Saturn reaches opposition this week. The Andromegasus Dipper scoops up as summer wanes.

2016 Perseids

Solar System

Get Ready for a Great Perseid Meteor Shower

The Perseids are here! With no Moon to spoil the show it's time to break out the lawn chairs, sit back, and watch the comet dust fly.

Waning crescent Moon passing Pollux and Castor at dawn, Aug. 12-14, 2023

Celestial News & Events

This Week's Sky at a Glance, August 11 – 20

The Perseid meteors come rushing in, and peak Perseid night ends with the waning crescent Moon triangulating Castor and Pollux. Vega and Sagittarius culminate after dark. Scorpius lays itself down.