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angular diameter

American  

noun

Astronomy.
  1. the angle that the apparent diameter of a celestial object subtends at the eye of the observer.


Etymology

Origin of angular diameter

First recorded in 1870–75

Example Sentences

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See Examples For:

The telescope spent 10 days of exposure time staring at a tiny patch of the sky in the Ursa Major constellation, just one-thirteenth of the moon’s angular diameter.

From Scientific American Jul. 15, 2022

Since we know how rapidly the Moon moves in its orbit around Earth, it is possible to calculate the angular diameter of the star.

From Textbooks Oct. 13, 2016

Unfortunately, the Sun is the only star whose angular diameter is easily measured.

From Textbooks Oct. 13, 2016

Confirm that the angular diameter of the Sun of 1/2° corresponds to a linear diameter of 1.39 million km.

From Textbooks Oct. 13, 2016

It is one-fifteenth the angular diameter of the full Moon as seen from Earth.

From "Cosmos" by Carl Sagan

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