The Rhythm of the Spheres

Reading the Night Sky

Wandering in Astronomy

The night sky is the oldest pattern of man, and every culture reads it differently. The stars above keep silent time, moving to a rhythm we are just now beginning to understand. Astronomy is where math, science, art, music, and words meet in a wondrous collision. In this section of our site, learn the basics of astronomy: from how a star chart is made, to projections and art that map the night sky, to how an astrolabe works just like it did thousands of years ago. Watch the North Star shift across centuries, explore how one sky has been mapped by many traditions, read what happened on this day in space, and see tonight’s moon for your location.

Map the Stars

The math behind star charts, with a projection explorer and a working astrolabe.

The Moving Sky

How the sky shifts across centuries, with a precession clock you can run.

The Traditions

One sky reads many ways, with a same-sky overlay of the world’s constellations.

This Day in the Stars

The sky’s events, discoveries, and lore tied to today’s date.

The Moon Tonight

Its phase and face, drawn live for where you’re standing.

โœฆ  Astronomy Picture of the Day  โœฆ

A Deep Sky Behind an Eclipsed Moon

May 24, 2022
Credit: Andrei Ionut Dascalu
See this entry on NASA's APOD โ†’
The plan was to capture a picturesque part of the sky that was hosting an unusual guest. The result included a bonus โ€” an additional and unexpected guest. The beautiful background features part of the central band of our Milky Way galaxy on the far left, and the colorful clouds of Rho Ophiuchi in the image center. The unusual guest, a dimmed and reddened Moon on the right, was expected because the image was taken during last week's total lunar eclipse . The timing had to be right because the Moon โ€” both before and after eclipse โ€” would be so bright it would overwhelm the background. The unexpected guest was the bright meteor across the image center. The fleeting meteor streak was captured on only one of the 10 consecutively-captured deep-field images from La Palma in the Spanish Canary Islands , while the eclipsed Moon image was taken immediately afterwards with the same camera and from the same location. The next total lunar eclipse โ€” also quite expected โ€” will occur in early November.

Notable Submissions to APOD: Total Lunar Eclipse of 2022 May

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โœฆ  EarthSky  ยท  Astronomy.com  ยท  Phys.org  โœฆ
Observing Nov 13, 2026

The Sky Today on Friday, November 13: Spot Mirachโ€™s Ghost

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Nov 13, 2026

Soul searching

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Sky This Week Nov 13, 2026

The Sky This Week from November 13 to 20: The Leonids peak

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Astronomy Nov 12, 2026

Hubble offers cosmic sampler of targets for Roman

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Astronomy Nov 12, 2026

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Astronomy Nov 12, 2026

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Astronomy Essentials Nov 12, 2026

Visible planets and night sky guide for November

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Space Nov 12, 2026

โ€˜Rosetta Stone for Mars:โ€™ Martian meteorite hints at ancient life

A rare 4.1-billion-year-old Martian meteorite, Teghaza 001, provides new clues about Mars' ancient and more habitable past.

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Astronomy Essentials Nov 12, 2026

Is there a North Star for Mars?

Is there a North Star for Mars ... a guide star for future explorers? Not in any satisfying way. But Martian stargazers wouldn't lack for things to see!

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