Celestial Navigation · Coordinates
Sidereal Hour Angle (SHA) is best defined as:
- AThe body's angular distance north or south of the celestial equator
- BThe arc of the celestial equator from the observer's meridian to the body
- CThe body's altitude above the celestial horizon at meridian transit
- DThe angular distance of a body measured westward from the First Point of Aries✓ Correct
Explanation
SHA is measured westward (0°–360°) along the celestial equator from the First Point of Aries to the hour circle of the body. It is the celestial analog used to fix a star's position relative to Aries.
Authority: Bowditch (Pub. No. 9)
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