Which of the angles in the previous question would be different when viewed from the North Pole?

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BlackTom AI · Accepted Answer

The question asks which angle measurements would change when viewing from the North Pole.
Option 1: 'Altitude would be different' — This is correct in general. The altitude (angle above the horizon) of a given celestial object depends on the observer's latitude. At the North Pole (latitude 90°N), the horizon is arranged such that a star’s altitude at its highest point (upper culmination) is related to its declination, and this is not the same as for observers at other latitudes. Therefore, the altitude can differ from what you’d observe elsewhere.
Option 2: 'Both altitude and declination would be the same' — This is incorrect because while the star’s declination is an intrinsic property of the object and does not depend on where you measure it from, the altitude does depend on your location. Since altitude can change with latitude, it is not guaranteed to be the same.
Option 3: 'Declination would be different' — This is incorrect. Declination is a coordinate on the celestial sphere tied to the star itself and does not vary with the observer’s position on Earth. So the observed declination remains the same.
Option 4: 'Both altitude and declination would be different' — This is incorrect for the same reason as above: declination does not change with viewing location, so both angles would not be different.

ASTR-1-45046-F25 Lecture: Sky Navigation

Which of the angles in the previous question would be different when viewed from the North Pole?

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