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.

✦  Astronomy Picture of the Day  ✦

Curiosity Self-Portrait Panorama

February 22, 2013
This remarkable self-portrait of NASA's Mars Curiosity Rover includes a sweeping panoramic view of its current location in the Yellowknife Bay region of the Red Planet's Gale Crater. The rover's flat, rocky perch, known as "John Klein", served as the site for Curiosity's first rock drilling activity. At the foot of the proud looking rover, a shallow drill test hole and a sample collection hole are 1.6 centimeters in diameter. The impressive mosaic was constructed using frames from the rover's Mars Hand Lens Imager (MAHLI) and Mastcam. Used to take in the panoramic landscape frames, the Mastcam is standing high above the rover's deck. But MAHLI, intended for close-up work, is mounted at the end of the rover's robotic arm. The MAHLI frames used to create Curiosity's self-portrait exclude sections that show the arm itself and so MAHLI and the robotic arm are not seen. Check out this spectacular interactive version of Curiosity's self-portrait panorama.

Customized Star Charts Coming 1st Quarter 2027

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✦  EarthSky  ·  Astronomy.com  ·  Phys.org  ✦
Observing Aug 29, 2026

The Sky Today on Saturday, August 29: Double star Zeta Lyrae

Looking for a sky event this week? Check out our full Sky This Week column.  August 28: Vesta stands still You may have heard of Epsilon (ε) Lyrae, the famous Double Double star in the constell…

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Aug 28, 2026

The progress of a Blood Moon

Philippe Moussette from Saint-Agapit, Quebec During the night of Aug. 27/28, 2026, the Moon passed nearly fully through Earth’s umbra in a partial lunar eclipse, turning a coppery red. This photo…

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Human Spaceflight Aug 28, 2026

Cast your vote to name Virgin Galactic’s next spaceplane

Virgin Galactic on Friday extended the deadline for the public to name one of its next-generation spaceplanes, giving space enthusiasts until Thursday to cast their votes. Virgin Galactic, whi…

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Space Aug 28, 2026

Nancy Grace Roman Space Telescope launches Sunday!

The launch of the Nancy Grace Roman Space Telescope is scheduled for Sunday morning, August 30, from the Kennedy Space Center. More here.

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Astronomy Aug 28, 2026

NASA telescope honors Nancy Grace Roman, architect of space-based astronomy

The Nancy Grace Roman Space Telescope is set to launch this weekend aboard a SpaceX rocket from Kennedy Space Center in Florida. When it becomes operational early next year, it will transform our v…

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Human World Aug 28, 2026

Best eclipse photos! Nearly total lunar August 27-28

EarthSky community photos of the lunar eclipse of August 27-28, 2026. Thanks to all who submitted eclipse photos!

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Space Aug 28, 2026

Meet a Saturn-sized exoplanet with Earth-like temperatures

TOI-199b is a warm Saturn-sized exoplanet 330 light-years away. New observations by the Webb space telescope show there is methane in its atmosphere.

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Astronomy Aug 28, 2026

Will new telescope Roman help reveal long-kept secrets of the universe? Q&A with an expert

On Sunday, Aug. 30, the Nancy Grace Roman Space Telescope is expected to launch from NASA's Kennedy Space Center in Florida. The observatory will join the Hubble Space Telescope, launched in 1990, …

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Astronomy Aug 27, 2026

ASTRID traces 13.5 billion years of black hole and galaxy evolution

In dark skies at night, distant starlight twinkles and speaks to vast cosmic histories almost as old as time itself. New data from instruments such as NASA's James Webb Space Telescope are helping …

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