Greenwich hour angle

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The hour angle of a celestial object as seen by an observer on the Greenwich meridian. GHA is a global standard. The hour angle for any other observer is simply GHA + λ, where λ is the observer's geographical longitude east. A star's Greenwich hour angle can be found by subtracting the star's right ascension from the Greenwich Sidereal Time.

Subjects: Astronomy and Astrophysics.

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