Answer:
Astronomers used the cross-staff for measuring the angle between the directions of two stars. ... Ships' officers used it to measure the elevation angle of the noontime Sun above the horizon, which allowed them to estimate their latitude
Explanation:
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Hello There! ^-^
The altitude of the north celestial pole above the horizon is determined by the observer's _______________ on the Earth.
Your answer: The altitude of the north celestial pole above the horizon is determined by the observer's latitude on the Earth.
The answer is latitude.
~Hope this helps!
