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The Spring 2011 issue of The Earth Scientist is focused on modernizing seismology education. Thanks to IRIS, you can download this issue for free as a pdf. Print copies are available in our online store.
This is a digital image of the scientific illustration known as, Scenographia Systematis Copernicani (the Copernican System) by Andreas Cellarius(1596-1665). Cellarius produced this illustration for his book, Harmonia Macrocosmica; posthumously published in 1660. Look closely to see a Sun-centered image with the Earth’s positions relative to the Sun at the beginning of each season.
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(c)1995 Visual Language, All Rights Reserved

The Changing Night Sky

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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The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

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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