constant of aberration

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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

Solar system illustration. (planets; sun)

Why Are Planets Round?

This close-up image of a dust storm on Mars was acquired by the Mars Color Imager instrument on NASA Mars Reconnaissance Orbiter on Nov. 7, 2007. This image is centered on Utopia Planitia

Do Hurricanes Happen on Other Planets?

Discover

Demystified - Do Lemmings Really Commit Mass Suicide? illustration

Do Lemmings Really Commit Mass Suicide?

Lake Mead (the impounded Colorado River) at the Hoover Dam. The light-coloured band of rock above the shoreline shows the decrease in water level in the first few years of the 21st century.

6 Lakes That Are Drying Up

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

Artist interpretation of space asteroids impacting earth and moon. Meteoroids, meteor impact, end of the world, danger, destruction, dinosaur extinct, Judgement Day, Doomsday Predictions, comet

Major Mass Extinctions

Time zone map with standard time zones and International Date Line

Why Are Some Time Zones 30 Minutes Off Instead of an Hour?

Wasp spider. Argiope bruennichi. Orb-weaver spider. Spiders. Arachnid. Cobweb. Spider web. Spider's web. Spider silk. Black and yellow striped wasp spider spinning a web.

Do We Really Swallow Spiders in Our Sleep?

constant of aberration: Related Content

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Topics

phase retrograde motion anomaly conjunction synodic period aphelion opposition sidereal period perturbation Kepler’s laws of planetary motion

Key People

James Bradley, detail of an oil painting after Thomas Hudson, c. 1742-47; in the National Portrait Gallery, London

James Bradley

English astronomer