Question

how did the travelers understand that all the stars are not equally visible from all parts of the earth​

Answer 1

Answer:

But why do we see different sets of stars — that is, different constellations — at different times of year? The answer is that the night sky changes because of Earth's orbit around the Sun, and as you'll see, this also explains the path called the ecliptic on the celestial sphere.

Answer 2

Answer:

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