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  ✦

The Flight Deck of Space Shuttle Endeavour

April 18, 2012
© Ben Cooper
What would it be like to fly a space shuttle? Although the last of NASA's space shuttles has now been retired, it is still fun to contemplate sitting at the controls of one of the humanity's most sophisticated machines. Pictured above is the flight deck of Space Shuttle Endeavour, the youngest shuttle and the second to last ever launched. The numerous panels and displays allowed the computer-controlled orbiter to enter the top of Earth's atmosphere at greater than the speed of sound and -- just thirty minutes later -- land on a runway like an airplane. The retired space shuttles are now being sent to museums, with Endeavour being sent to California Space Center in Los Angeles, California, Atlantis to the Kennedy Space Center Visitor Complex on Merritt Island, Florida, and Discovery to the Udvar-Hazy Annex of the National Air and Space Museum in Chantilly, Virginia. Therefore sitting in a shuttle pilot's chair and personally contemplating the thrill of human space flight may actually be in your future. Developing Gallery: Flyover of Space Shuttle Discovery atop a 747

Customized Star Charts Coming 1st Quarter 2027

We respect your privacy. Unsubscribe at any time.

✦  EarthSky  ·  Astronomy.com  ·  Phys.org  ✦
Astronomy Sep 27, 2026

Astronomers discover a radio galaxy with evidence of four separate jet outbursts

Astronomers have identified what may be the first example of a new class of radio galaxy, one whose central black hole appears to have launched powerful jets on four separate occasions. High-resolu…

Read
Today in the History of Astronomy Sep 27, 2026

Sept. 27, 1918: The birth of Martin Ryle

Born Sept. 27, 1918, and educated at Bradfield College and Oxford University in the U.K., Martin Ryle would go on to be the first astronomer royal (1972-1982) with a background in radio astronomy. …

Read
Sun Sep 27, 2026

Sun news: Fast solar wind might brush Earth

Sun news September 27, 2026: The sun stayed quiet as busy AR4534 slipped behind the limb. A small coronal hole stream could still bring a G1 storm today.

Read
Astronomy Essentials Sep 27, 2026

Visible planets and night sky guide late September and October

Visible planets and night sky guide. Full moon night has passed. But the Harvest Moon effect continues. What is a Harvest Moon anyway? Video and info here.

Read
Space Sep 27, 2026

JUICE mission to fly by Earth Monday: Details here

The JUICE mission will perform a flyby of Earth next week on September 28. The spacecraft is headed toward Jupiter's icy moons, where it will arrive in 2031.

Read
Observing Sep 27, 2026

The Sky Today on Sunday, September 27: Catch Saturn’s satellites

Looking for a sky event this week? Check out our full Sky This Week column.  September 26: The Harvest Moon The Moon now passes 7° north of Saturn at 8 A.M. EDT. The ringed planet c…

Read
Astronomy Sep 26, 2026

Black hole jets reach far beyond galaxies' visible edges, potentially deciding their fate

Galaxies are enormous and hold hundreds of billions of stars. These stars form from cold, dense gas. Every large galaxy, including the Milky Way, is wrapped in a huge envelope of gas called the cir…

Read
Observing Sep 26, 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 sunl…

Read
Astronomy Sep 25, 2026

An overlooked era of cosmology is stealing the show in the quest to understand the cosmos

Could you imagine if pagers made a comeback? Sure, your smartphone would still be your notepad-flashlight-camera-personal assistant-MP3 player-wallet-social media browser. But imagine if pagers mad…

Read