Celestial Navigation Calculator

Noon sight latitude calculator and worked examples.

Noon Sight Formula:

Latitude = Declination ± Zenith Distance, where ZD = 90° − Ho (corrected)

Same hemisphere as sun: Lat = Dec + ZD. Opposite hemisphere: Lat = Dec − ZD (or ZD − Dec if ZD > Dec)

Observed Altitude Ho (degrees)

Sextant Correction (±°)

Declination (degrees)

Observer Hemisphere