Which of the following points remains fixed in the sky relative to an observer's horizon over a time scale of 100 years?
A) the direction to a distant star (e.g., Betelgeuse, in Orion)
B) the north celestial pole
C) the winter solstice
D) the vernal equinox

Question

Quizplus · Accepted Answer

The north celestial pole remains fixed in the sky relative to an observer's horizon over a time scale of 100 years. This is because the Earth's axis of rotation is pointed towards this point in the sky, and although the axis precesses over time, it does not move far enough to cause the north celestial pole to shift significantly in 100 years. The other choices (A, C, and D) all involve points in the sky that move relative to an observer's horizon due to the Earth's rotation and/or revolution.

Which of the Following Points Remains Fixed in the Sky