Measure the altitude of polaris above the northern horizon,
using the sextant.
This was rapidly developed into the modern
marine sextant.
Sextant observation
that the navigator decides that he has witnessed the passing of maximum altitude ( i.e.
We
have a sextant
which i used to use every week for practice.
Table 1 illustrates these differences for the test and control brushes for the anterior and
posterior sextants
of the mandible and maxilla.
In the case to the side are many instruments
including the first sextant, made by john bird in about 1757.
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