Latitude from Polaris

Latitude from a Polaris altitude using the a₀ + a₁ + a₂ Nautical Almanac corrections.

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

L = H_o + a_0 + a_1 + a_2 - 1^\circ

Symbol	Meaning	Unit
$H_o$	Observed altitude (corrected)	°
$a_0$	Polaris main correction by LHA Aries	'
$a_1$	Latitude correction	'
$a_2$	Month correction	'
$L$	Latitude	°

Source: HM Nautical Almanac

Latitude from a Polaris altitude using the a\u2080 + a\u2081 + a\u2082 Nautical Almanac corrections.