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Constellations: The Changing Night Sky - Windows to the Universe
Art and science combine to show an ancient view of the Sun and Earth. Look closely to see the Sun in the center. Four images of Earth surround the Sun. Each Earth represents the different seasons, spring, summer, autumn and winter. Original art by Andreas Cellarius (1596-1665).
Click on image for full size
(c)1995 Visual Language, All Rights Reserved

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Back to The Universe

The Changing Night Sky

If you look at the night sky 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. 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, if you think about it there are 365 days per year and 360 degrees in a circle. Anyway, the sky doesn't shift, it is another case of apparent motion. The "shift" of the sky is really the motion of the earth around the sun.

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA