Celestial Navigation · Star Identification — Selected Stars
Pub. 249 Volume 1 lists, for each whole degree of LHA Aries and latitude:
- ATide predictions
- BAll 57 navigational stars with no computation
- COnly the sun's GHA
- DSeven selected stars with precomputed Hc and Zn, chosen for good distribution✓ Correct
Explanation
Volume 1 precomputes Hc and Zn for seven favorably placed selected stars per latitude/LHA-Aries entry, marking three with diamonds as best for a three-star fix. It speeds star selection and reduction and is reissued for a given epoch.
Authority: Pub. No. 249, Volume 1
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Related Celestial Navigation questions
- Time
The Nautical Almanac tabulates the positions of celestial bodies against which time standard?
- Time
A vessel in west longitude has a zone description of +5. To convert zone time to UT you must:
- Coordinates
How is the GHA of a star obtained from the Nautical Almanac?
- Coordinates
Sidereal Hour Angle (SHA) is best defined as:
- Coordinates
Declination of a celestial body is the celestial equivalent of:
- The Nautical Almanac
Approximately how fast does the GHA of the Sun increase with time?