Image: (c)1995 Visual Language, All Rights Reserved
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If you look at the night sky at different times of the year you see
different constellations. This change is due to the motion of the
Earth in its orbit around the Sun. As the Earth revolves about the
Sun, the Sun appears to move through the constellations. Therefore,
different constellations will be visible in our night sky at different
times of the year. You can't see the stars if the Sun is near them!
Each day a few stars are visible in the east that were not visible the
night before. If you were to measure how much the sky shifted from one
day to the next you would discover that it shifts approximately one
degree per day. This should not be surprising because there are 365
days per year and 360 degrees in a circle, like that of the Earth's
orbit. The Sun appears to move about one degree in the sky per day as
the Earth goes around it, which means the the shift in the stars and
constellations we see each night must be about one degree.
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