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

WISPIT 2b: Exoplanet Carves Gap in Birth Disk

August 27, 2025
Credit: ESO , VLT , SPHERE ; Processing & Copyright: ESO , Richelle van Capelleveen ( Leiden Obs. ) et al. ; Text: Ogetay Kayali ( MTU )
See this entry on NASA's APOD โ†’
That yellow spot -- what is it? It's a young planet outside our Solar System. The featured image from the Very Large Telescope in Chile surprisingly captures a distant scene much like our own Solar System's birth, some 4.5 billion years ago. Although we can't look into the past and see Earth's formation directly, telescopes let us watch similar processes unfolding around distant stars. At the center of this frame lies a young Sun-like star, hidden behind a coronagraph that blocks its bright glare. Surrounding the star is a bright, dusty protoplanetary disk -- the raw material of planets. Gaps and concentric rings mark where a newborn world is gathering gas and dust under its gravity, clearing the way as it orbits the star. Although astronomers have imaged disk-embedded planets before, this is the first-ever observation of an exoplanet actively carving a gap within a disk -- the earliest direct glimpse of planetary sculpting in action.

Customized Star Charts Coming 1st Quarter 2027

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Today in the History of Astronomy Nov 10, 2026

Nov. 10, 1861: The birth of Robert Innes

Born Nov. 10, 1861, in Scotland, Robert Thorburn Ayton Innes would reshape our understanding of our cosmic neighborhood when he discovered our nearest stellar neighbor, Proxima Centauri, in 1912. Iโ€ฆ

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Observing Nov 10, 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

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Space Nov 10, 2026

Atmosphere of lava planet: โ€˜A cloudy, reflective sunscreenโ€™

New observations of super-Earth TOI-561 b by the Webb telescope show again that the atmosphere of lava planet TOI-561 b does exist, and is very reflective.

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Sun Nov 10, 2026

Sun news: Powerful sunspot region facing Earth

Sun news November 10, 2026: Sunspot AR4566 faces Earth and fired 18 C flares over the past day. Could it send an eruption our way?

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Astronomy Essentials Nov 10, 2026

Visible planets and night sky guide for November

Visible planets and night sky guide: Look for bright Jupiter and red Mars! They are getting closer each day and will appear closest together on November 15โ€“17.

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Observing Nov 10, 2026

The Sky Today on Tuesday, November 10: Seek Saturnโ€™s two-toned moon

Looking for a sky event this week? Check out our full Sky This Week column.  November 9: Chase Comet 161P/Hartley-IRAS Challenge yourself to pick up Saturnโ€™s moon Iapetus, which toโ€ฆ

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Astronomy Nov 9, 2026

The ELT can probe ultra-diffuse galaxies and their dark matter mysteries

We've been waiting a long time for the Extremely Large Telescope's first light, scheduled for March 2029. Telescopes this large, powerful and costly always have multiple science goals, and that's tโ€ฆ

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Astronomy Nov 9, 2026

A stellar odd couple at an unusual stage of evolution

Most of the stars in the Milky Way are what we might call normal stars. They're main sequence stars like our sun, meaning they're doing what most people probably think stars do: shining as they fusโ€ฆ

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Astronomy Nov 9, 2026

The supernova impostor: Chandra finds likely source of giant star's repeated outbursts

Using NASA's Chandra X-ray Observatory, astronomers have discovered what is triggering repeated outbursts from a giant, unstable star.

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