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Astronomy Essentials
Neptune at opposition to the sun this weekend
Editors of EarthSky
September 20, 2024
Astronomy Essentials
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Visible planets and night sky guide for September
Marcy Curran
September 20, 2024
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Are day and night equal on the equinox?
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Tonight
Neptune at opposition to the sun this weekend
Neptune at opposition - when it's 180 degrees from the sun on the sky's dome - comes early on September 21, 2024. You'll need optical aid to spot it.
Editors of EarthSky
September 20, 2024
Visible planets and night sky guide for September
September 20, 2024
Meteor shower guide 2024: The Draconids best around Oct 8
September 1, 2024
2024 September equinox: All you need to know
September 22, 2024
Delta Cephei helps measure cosmic distances
September 24, 2024
An annular solar eclipse on October 2, 2024
October 1, 2024
What’s that bright star by the moon? It’s Venus!
October 5, 2024
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Astronomy Essentials
View All
Neptune at opposition to the sun this weekend
Editors of EarthSky
September 20, 2024
Visible planets and night sky guide for September
Marcy Curran
September 20, 2024
Are day and night equal on the equinox?
Bruce McClure
September 20, 2024
Equinox sun above horizon all day at the poles
Theresa Wiegert
September 19, 2024
Brightest Stars
View All
Meet Delta Scorpii, aka Dschubba, it’s a variable star
Don Machholz
July 24, 2024
Summer Triangle star: Vega is bright and blue-white
Larry Sessions
July 19, 2024
Summer Triangle star Deneb is distant and luminous
Larry Sessions
July 12, 2024
Summer Triangle star: Altair is variable and spins fast!
Larry Sessions
July 10, 2024
Constellations
View All
Cassiopeia ascends in September and October
Editors of EarthSky
September 13, 2024
Corona Australis is the sparkling Southern Crown
Kelly Kizer Whitt
September 12, 2024
Telescopium the Telescope is below the Teapot
Kelly Kizer Whitt
August 29, 2024
Sagitta the Arrow lies inside the Summer Triangle
Kelly Kizer Whitt
August 27, 2024
Clusters Nebulae Galaxies
View All
The Andromeda galaxy: All you need to know
Bruce McClure
September 5, 2024
The Great Rift is a dark swath in the Milky Way
Bruce McClure
August 28, 2024
The Wild Duck Cluster, M11, a lovely open cluster in Scutum
Bruce McClure
August 8, 2024
M6 and M7: Open star clusters in the Scorpion’s Tail
Bruce McClure
July 18, 2024
Favorite Star Patterns
View All
Great Square of Pegasus gallops into the autumn sky
Deborah Byrd
September 10, 2024
Teapot of Sagittarius points to Milky Way center
Bruce McClure
August 23, 2024
The Northern Cross: Find the backbone of the Milky Way
Bruce McClure
July 25, 2024
Coathanger cluster: This star pattern looks like its name
Bruce McClure
July 9, 2024