Celestial Navigation · Sight Reduction — Declination Increment
In Pub. 229, when the declination is not a whole degree, the tabulated Hc is adjusted using:
- AThe equation of time
- BThe declination increment and the tabulated altitude difference (d), interpolated for the minutes of declination✓ Correct
- CThe dip correction
- DThe index error
Explanation
Pub. 229 tabulates Hc for whole degrees of declination and gives an altitude difference (d). The minutes of declination are applied to d (with the interpolation tables) to correct the tabulated Hc to the precise value before comparing with Ho.
Authority: Pub. No. 229; Bowditch (Pub. No. 9)
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