Celestial Navigation · The Nautical Almanac
Approximately how fast does the GHA of the Sun increase with time?
- AAbout 1° per hour
- BAbout 15° per hour✓ Correct
- CAbout 15° per minute
- DAbout 360° per minute
Explanation
The Earth rotates 360° in 24 hours, so GHA increases at about 15° per hour (15° = 360°/24). This is why the 'Increments and Corrections' pages add roughly 15' of arc per minute of time.
Authority: Nautical Almanac
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