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Celestial coordinates seen by an observer in mid-northern latitudes. His celestial meridian is a great circle passing through his zenith and the poles. His astronomical horizon meets the celestial sphere at infinity.

Earth's celestial sphere: Stars, planets, and other heavenly bodies

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Colorful winter sunset

What's the Difference Between a Solstice and an Equinox?

Planet Earth and lunar moon from space

Where Did the Moon Come From?

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

Arrangement of the phases of the moon in total eclipse with Blood Moon

9 Celestial Omens

Blackboard inscribed with scientific formulas and calculations in physics and mathematics

The World Science Festival’s Pioneers in Science

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Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001 in New York City. The crash of two airliners hijacked by terrorists loyal to al Qaeda leader Osama bin..

All 81 References in Fall Out Boy’s “We Didn’t Start the Fire,” Explained

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

Secret Service Agent Listens To Earpiece

Secret Service Code Names of 11 U.S. Presidents

Shoebill. A Shoebill Stork (Balaeniceps rex), aka 'Whalehead' standing in shallow marsh. Resides in tropical East Africa. A very large bird related to the storks. It derives its name from its massive shoe-shaped bill.

Funky Feathers: 10 Bizarre Birds

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

Why Is the Mona Lisa So Famous?

nadir: Media

astronomy

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Earth's celestial sphere: Stars, planets, and other heavenly bodies

Earth's celestial sphere: Stars, planets, and other heavenly bodies

Explanation of the celestial sphere.

Video: Encyclopædia Britannica, Inc.

Images

Celestial coordinates seen by an observer in mid-northern latitudes. His celestial meridian is a great circle passing through his zenith and the poles. His astronomical horizon meets the celestial sphere at infinity.

Celestial coordinates seen by an observer in mid-northern latitudes. His celestial...

Encyclopædia Britannica, Inc.

VIEW MORE in these related Britannica articles: