Chapter 29, Problem 1RCC

Why does an observer at a given location see one set of constellations in the winter and a different set of constellations in the summer?

To determine

To find:

The reason why an observer at a given location sees one set of constellations in the winter and a different set of constellations in the summer.

Answer to Problem 1RCC

Solution:

The revolutionary movement of the Earth around the sun results in a continuous shift during the night view of the universe and the constellations appear to migrate towards the west. Thus, at a given location, one can see one set of constellations in the winter and a different set of constellations in the summer.

Explanation of Solution

A constellation is a group of the star which forms a pattern in the sky and given a traditional name. One can perceive three types of motion when looking upward to the celestial bodies. These three motions are daily motion, yearly motion, and intrinsic motion.

In yearly motion, the Earth revolves around the sun that results in a continuous shift during the night view of the universe. The Earth is on the opposite side of the Sun during summer and winter. So, the constellations seen in the winter are completely different from the constellations seen in the summer.

Therefore, an observer at a given location sees one set of constellations in the winter and a different set of constellations in the summer because the night view of the universe is different for summer and winter.