Sextants are used to measure angular heights of celestial bodies
above the horizon to find the latitude and longitude of the
observer. They can also be used on land with artificial horizons.
Sextants can also be used to find the correct Universal Time by
measuring the angular distance between the moon and another body
along its path across the zodiac. In coastal waters or on land,
sextants can be used for very accurate piloting by measuring the
horizontal angles between charted landmarks. The vertical angle of
a peak above its baseline determines the distance to it, which,
combined with a compass bearing, yields a position fix from just
one landmark. The angular dip of an object (island or vessel) below
the visible horizon can also be used to determine the distance to
it. This booklet explains how to get the best results from plastic
sextants, and presents numerical comparisons with similar data from
metal sextants. Sextant piloting techniques are also reviewed as
they are an ideal use of a plastic sextant.
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