# What is hour circle?

Last Update: April 20, 2022

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**Asked by: Jocelyn Dare**

Score: 4.6/5 (54 votes)

In astronomy, the hour circle, which together with declination and distance determines the location of any celestial object, is the great circle through the object and the two celestial poles.

## What does an hour with a circle around it mean?

The hour circle **that at any moment is passing through an observer's zenith is his meridian**. ... Related Topics: Hour angle Equatorial system. The term also refers to a scale on the mounting of an equatorial telescope, indicating the hour angle at which the telescope is aimed.

## How many hours are in a circle?

The hour circles (meridians) are measured in hours (or hours, minutes, and seconds); one rotation (360°) is equivalent to **24 hours**; 1 hour is equivalent to 15°.

## What is measured westward from the hour circle of allies to the hour circle of the body?

**The hour angle** of any celestial body may then be defined as the angular distance measured westward along the equator from the meridian of reference to the hour circle through the body. Hour angles are expressed either in hours of time or in degrees of arc.

## Do hour angle and hour circle mean the same?

Hour angle, in astronomy, the angle between an observer's meridian (a great circle passing over his head and through the celestial poles) and the hour circle (any other great circle passing through the poles) on **which some celestial body lies**.

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