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

Apollo 11 Landing Panorama

July 23, 2022
Credit: Neil Armstrong , Apollo 11 , NASA
See this entry on NASA's APOD โ†’
Have you seen a panorama from another world lately? Assembled from high-resolution scans of the original film frames, this one sweeps across the magnificent desolation of the Apollo 11 landing site on the Moon's Sea of Tranquility . The images were taken by Neil Armstrong looking out his window of the Eagle Lunar Module shortly after the July 20, 1969 landing . The frame at the far left ( AS11-37-5449 ) is the first picture taken by a person on another world. Toward the south, thruster nozzles can be seen in the foreground on the left, while at the right, the shadow of the Eagle is visible to the west. For scale, the large, shallow crater on the right has a diameter of about 12 meters. Frames taken from the Lunar Module windows about an hour and a half after landing, before walking on the lunar surface , were intended to initially document the landing site in case an early departure was necessary.

Customized Star Charts Coming 1st Quarter 2027

We respect your privacy. Unsubscribe at any time.

โœฆ  EarthSky  ยท  Astronomy.com  ยท  Phys.org  โœฆ
Astronomy Nov 12, 2026

Hubble offers cosmic sampler of targets for Roman

A gallery of gravitational lenses captured by NASA's Hubble Space Telescope showcases the diversity of this cosmic phenomenon and lays the groundwork for follow-up observations by the new Nancy Graโ€ฆ

Read
Astronomy Nov 12, 2026

Space telescope Euclid sets the new standard for cosmology

On July 1, 2023, the European Space Agency (ESA) launched the Euclid space telescope into space. Its mission: to create the largest and most detailed map of the universe ever made.

Read
Astronomy Nov 12, 2026

A rare star system emits radio signals every 8 minutes

Scientists at the Curtin University node at the International Center for Radio Astronomy Research (ICRAR) have linked mysterious radio pulses to an unusual pairing of starsโ€”a dead star that spinsโ€ฆ

Read
Today in the History of Astronomy Nov 12, 2026

Nov. 12, 2014: The Philae lander touches down on a comet

The European Space Agencyโ€™s Rosetta mission launched March 2, 2004, on a 4-billion-mile (6.4 billion kilometers) path to Comet 67P/Churyumov-Gerasimenko. The mission consisted of the Rosetta orbiโ€ฆ

Read
Observing Nov 12, 2026

2026 Full Moon calendar: When to see the Full Moon and phases

The phenomenon of a Full Moon arises when our planet, Earth, is precisely sandwiched between the Sun and the Moon. This alignment ensures the entire side of the Moon that faces us gleams under sunlโ€ฆ

Read
Astronomy Essentials Nov 12, 2026

Visible planets and night sky guide for November

Visible planets and night sky guide: Look west shortly after sunset to see earthshine on the crescent moon. And watch a video here about the Leonid meteors.

Read
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.

Read
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!

Read
Observing Nov 12, 2026

The Sky Today on Thursday, November 12: An open cluster in Perseus

Looking for a sky event this week? Check out our full Sky This Week column.  November 11: Venus comes to a halt The constellation Perseus is famous for its bright Double Cluster, butโ€ฆ

Read