Find latitude by Polaris & taking noon sun sights
Let's assume a position for the observer. In this case, let the observer's geographical latitude be equals to 'x'.
Altitude: The ‘latitude’ of the celestial body, measuring from the horizon up to the zenith of an observer (90 degrees). The angle is measured with a sextant or other navigational instruments.
Since altitude = 90 degrees - angle Z (angle Z = angle W)
= 90 degrees -angle W
= geographical latitude 'x'
Therefore, altitude of the Polaris above the horizon is the same as the observer's geographical latitude! And latitude can be measured with a sextant.
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