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 Furious Sky over Mount Shasta

September 28, 2022
Credit: Ralf Rohner
See this entry on NASA's APOD โ†’
Is the sky angry with Mount Shasta? According to some ancient legends , the spirits of above and below worlds fight there, sometimes quite actively during eruptions of this enormous volcano in California , USA . Such drama can well be imagined in this deep sky image taken in late June. Evident above the snow-covered peak is the central band of our Milky Way Galaxy , on the left, and a picturesque sky toward the modern constellations of Scorpius and Ophiuchus , above and to the right. The bright orange star Antares and the colorful rho Ophiuchi cloud complex are visible just to the right of Mount Shasta, while the red emission nebula surrounding the star zeta Ophiuchi appears on the top right. The static earth image in the featured composite was taken during the blue hour , while a two-panel panorama tracking the background sky was taken later that night with the same camera and from the same location. Within a few million years, Antares , some stars in the rho Ophiuchi system , and zeta Oph iuchi will all likely explode as supernova s.

Customized Star Charts Coming 1st Quarter 2027

We respect your privacy. Unsubscribe at any time.

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

Independent technique validates landmark M87* image

The 2019 Event Horizon Telescope (EHT) image was the work of hundreds of scientists and captured the first direct view of a black hole's shadowโ€”becoming one of the most recognized scientific imagโ€ฆ

Read
Astrophotography Nov 11, 2026

ZWO introduces the Seestar S30 Plus

ZWO has added a new entry point to its smart telescope lineup. The Seestar S30 Plus went on sale Nov. 10 for $499 โ€” $474 for a limited time โ€” undercutting the S30 Pro by $200 and making it the โ€ฆ

Read
Astronomy Nov 11, 2026

Centaurus A in the spotlight: Plasma simulations reproduce black hole jets' mysterious bright edges

Around 12 million light-years away, the supermassive black hole of the galaxy Centaurus A is hurling two enormous plasma jets into space at nearly the speed of light. These so-called jets are brighโ€ฆ

Read
Nov 11, 2026

Taula eclipse

Josh Dury, taken from Menorca, Spain The Aug. 12, 2026, total solar eclipse sets over Talatรญ de Dalt, a late Bronze Age settlement on the Spanish island of Menorca. The Sun’s partial phases โ€ฆ

Read
Astronomy Essentials Nov 11, 2026

Visible planets and night sky guide for November

Visible planets and night sky guide: Watch our video to discover the Leonid meteor showerโ€™s spectacular history, what to expect in 2026, and how to catch the show!

Read
Space Nov 11, 2026

This active asteroid has grown a tail! What happened?

Active asteroid 1995 BJ4 has grown a cometlike tail, leaving astronomers wondering whatโ€™s happening.

Read
Space Nov 11, 2026

A runaway star speeds in an unusual direction

A runaway star moves faster and in a different direction from the general stream of stars in our Milky Way Galaxy. Why?

Read
Astronomy Nov 11, 2026

Earliest known compact quasar pair poses a black hole growth puzzle

The oldest pair of compact quasars ever observed has been found only 900 million years after the Big Bang. Scientists say there is no theoretical explanation for how the pair of actively feeding blโ€ฆ

Read