__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.

Back to 'Simple Celestial Navigation with sextant'

Continue to ' Finding latitude by noon sun sights'