Definition
Sight Reduction Tables for Marine Navigation cover latitudes 0 to 90 degrees in six volumes of 15 degrees each. Entered with whole degrees of latitude, declination and LHA, they give computed altitude, an altitude difference d for interpolating the declination minutes, and azimuth angle Z. They are usable for any body and provide high precision, at the cost of bulk and an interpolation step. The US designation is HO229 and the British is NP401.
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