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A SEXTANT.
It is an instrument of two mirrors, where the angle can be adjusted.
The observer puts his eye to the eye glass, to see the two mirros. He first observes the given star, through one glass. Then adjusts the angle so he can see the horizon through the other glass. So he is seeing both the given star and the horizon. The given angle between the two mirrors will be used to estimate the latitude for navigational purposes.
If the SUN is used as the observational star, then 1; a darkened mirror is used , to avoid blindness, and 2 ; the angle measured is the latitude.
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