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, from how a star chart is made, to projections and art that maps the night sky, to how an astrolabe works the same way as it did thousands of years ago. Watch the North Star shift across centuries and explore how one sky has been mapped by many traditions. Check what happened on this day in space or see tonight’s moon drawn for where you stand.

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  ✦

Six Moons of Saturn

August 11, 2026
© Alexandre Trentini
How many moons does Saturn have? While the total will likely continue to grow, as of June 2026 the ringed gas giant had 293 confirmed moons. That's easily more than any other planet of the Solar System, including ruling gas giant Jupiter with a mere 115 confirmed moons. Most of Saturn's known moons are small, irregular satellites. Many are only few kilometers to a fraction of a kilometer across and grouped in tilted outer orbits. Six of its largest satellites can be seen here, though, in this sharp telescopic Saturnian family portrait taken on August 5. Larger than Earth's Moon and even slightly larger than inner planet Mercury, Titan, with a diameter of 5,150 kilometers, is at lower right. You can also spot icy major moons Mimas, Tethys, Enceladus, Dione, and Rhea in the frame. Saturn's first known natural satellite, Titan was discovered in 1655 by Dutch astronomer Christiaan Huygens. During the space age Voyager and Cassini discoveries have added to the swelling ranks of Saturnian moons. NASA Stream: August 12 Total Solar Eclipse.

Customized Star Charts Coming 4th Quarter 2026

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✦  EarthSky  ·  Astronomy.com  ·  Phys.org  ✦
Observing Aug 11, 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…

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Astronomy Aug 11, 2026

Three energy-loss routes may explain Tarantula Nebula's X-ray shortfall

Like a collage made of layered sheets of colored cellophane, a vibrant new image layers observations of a famous star-forming nebula from NASA's space telescopes. The resulting cosmic "craft" revea…

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Astronomy Aug 11, 2026

Star cluster discovery could change how scientists measure the universe

University of Missouri researchers have uncovered evidence that challenges one of astronomy's most trusted assumptions, a breakthrough that could reshape how scientists measure galaxies and reconst…

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Astronomy Aug 11, 2026

Twisted magnetic field around newborn star confirms decades-old jet theory

Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA), of which the U.S. National Science Foundation National Radio Astronomy Observatory (NSF NRAO) is a partner, have captured …

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Human World Aug 11, 2026

5th batch of Pentagon UAP files: Orbs and triangles

The 5th batch of the Pentagon UAP files was released on August 7, 2026. The videos, documents and images include reports of more orbs, triangles and more.

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Aug 11, 2026

Dying lights

Greg Meyer, taken from Starfront Observatory, near Brady, Texas Two faint planetary nebulae glow in Cassiopeia — Abell 6 (lower left), about 3,750 light-years away, and HFG1 (upper right), roughl…

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Today in the History of Astronomy Aug 11, 2026

Aug. 11, 1877: Asaph Hall discovers Deimos

After spending the 1850s at Harvard Observatory calculating orbits, Asaph Hall became an assistant at the U.S. Naval Observatory at Washington, D.C., in 1862. He was quickly promoted, and by 1873 h…

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Astronomy Essentials Aug 11, 2026

Perseid meteor shower 2026! It’s time to watch

The Perseid meteor shower peaks this week! It's best between midnight and dawn. The peak is August 12 and 13 before dawn, but watch around those mornings, too.

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Astronomy Essentials Aug 11, 2026

Total solar eclipse to dazzle observers on August 12

The Arctic, Greenland, Iceland and Spain will have a total solar eclipse on August 12, 2026. Parts of Europe and North America will see a partial.

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