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.
Selfie at Vera Rubin Ridge
APOD's email for image submissions has changed. Please see: APOD Submissions.
Customized Star Charts Coming 1st Quarter 2027
We respect your privacy. Unsubscribe at any time.
NASA's new UV space telescope will launch in 2031
Most of us could spend our entire lives looking at the night sky and see very few changes. The moon becomes more or less illuminated, the planets drift placidly through the sky, satellites and the …
ReadA stellar illusion
Behyar Bakhshandeh from Carlsbad, California The emission nebula IC 1318, also known as the Gamma Cygni Nebula, glows roughly 5,300 light-years away in Cygnus — far beyond Sadr, the bright superg…
ReadGhostly Cat's Head Nebula lurks within sight of NASA's Hubble, Webb
NASA's Hubble and James Webb Space Telescopes have captured a hauntingly dynamic star-forming scene, like a spectral form rising out of a cold mist. It lies within the vast Carina Nebula, a diffuse…
ReadRubin observatory reveals two hidden companions of the Milky Way
Preview data from the recently completed NSF-DOE Vera C. Rubin Observatory in Chile point to a wave of discoveries that may complete the census of the Milky Way's neighboring galaxies—including i…
Read2026 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…
ReadOct. 29, 1998: John Glenn returns to space
John Glenn became the first American to orbit Earth when he blasted off in Friendship 7 on Feb. 20, 1962. His flight made him an American hero during the heights of the Space Race, and the oldest m…
ReadIs this our solar system’s future? Scientists spot disk around dead star
Researchers have discovered a white dwarf surrounded by a debris disk with 2 separate rings. It offers a possible glimpse of our solar system's future.
ReadThe enormous oarfish could inspire new ways to explore the ocean
The giant oarfish has a remarkable fin that could inspire quieter underwater robots and open new possibilities for ocean exploration and conservation.
ReadVisible planets and night sky guide for October and November
Visible planets and night sky guide. Tomorrow morning, the moon will hang near Castor and Pollux, the twin stars of Gemini.
Read