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

Milky Way Urban Style

June 26, 2026
Credit: Shingoo Lee
See this entry on NASA's APOD โ†’
In a cosmic vista you can never see, the Milky Way arcs through the night above Seoul, South Korea. Remarkably, this urban night skyscape reveals our galaxy's faintly luminous central region and dark obscuring dust clouds in spite of the brilliant city lights . To overcome the extreme light pollution of the metropolitan area and record faint cosmic details, an infrared filter was used to capture the night scene in a single exposure. While the filter transmits predominately infrared light, it still passes some visible light to give the scene a natural appearance. The view is from Seoul's Ttukseom Hangang Park, with the Han River and a well lit railway bridge across the foreground. The 123 story Lotte World Tower looms in the distance, the tallest building in South Korea.

Customized Star Charts Coming 1st Quarter 2027

We respect your privacy. Unsubscribe at any time.

โœฆ  EarthSky  ยท  Astronomy.com  ยท  Phys.org  โœฆ
Today in the History of Astronomy Nov 4, 2026

Nov. 4, 1922: Tutankhamunโ€™s tomb is discovered

When archaeologists peered inside Tutankhamunโ€™s tomb a few weeks after its discovery on Nov. 4, 1922, they found antechambers packed to the brim with thousands of artifacts: statues, furniture, jโ€ฆ

Read
Observing Nov 4, 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
Space Nov 4, 2026

A new mini-moon for Earth! Meet 2026 QQ8

Earth has another new mini-moon! The little space rock 2026 QQ8 began orbiting Earth in April and will stay through 2026.

Read
Human World Nov 4, 2026

Crew emerges from Mars habitat simulation after yearlong test

On October 31, 2026, 4 participants in NASA's Mars habitat simulation emerged after 1 year of testing for what astronauts might encounter on a visit to Mars.

Read
Astronomy Essentials Nov 4, 2026

Visible planets and night sky guide for November

Visible planets and night sky guide. Tomorrow, look for the peaking South Taurid meteors, and Venus will hang near Spica at dawn.

Read
Observing Nov 4, 2026

The Sky Today on Wednesday, November 4: Venus and Spica stand close

Looking for a sky event this week? Check out our full Sky This Week column.  November 3: The Moon passes Regulus Venus sits 2ยฐ south of Virgoโ€™s brightest star, Spica, in the earlyโ€ฆ

Read
Astronomy Nov 3, 2026

JWST may have found where heavy black hole seeds formed

Astrophysicists think that the supermassive black holes (SMBH) we see in the modern universe are the result of a long, drawn-out process. That process is referred to as the hierarchical black hole โ€ฆ

Read
Astronomy Nov 3, 2026

A tiny shift exposes a cold brown dwarf masquerading as an early galaxy

A faint red object spotted by the James Webb Space Telescope originally appeared to offer a possible glimpse of the universe's first galaxies. But images taken about 3ยฝ years apart revealed a giveโ€ฆ

Read
Astronomy Nov 3, 2026

Leviathan's sprawling stars challenge idea that dusty giants become compact galaxies

Astronomers using the James Webb Space Telescope (JWST) have confirmed a massive, dust-rich galaxy called Leviathan in the early universe. Seen when the universe was roughly 1.5 billion years old, โ€ฆ

Read