Celestial Navigation · Declination
The 'd' correction listed beside a body's declination in the Nautical Almanac accounts for:
- AThe change in declination during the hour, applied for minutes/seconds✓ Correct
- BThe observer's height of eye
- CRefraction
- DIndex error
Explanation
The 'd' value is the hourly rate of change of declination; it is interpolated for the minutes and seconds and applied (added or subtracted depending on whether declination is increasing or decreasing).
Authority: The Nautical Almanac, declination and d correction
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