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looks at one of the most powerful creations of Greek science, mathematical astronomy, created by Hipparchus in the second century B.C. and given final form by Ptolemy in the second century A.D.
Read morehttp://www.ibiblio.org/expo/vatican.exhibit/exhibit/d-mathematics/Greek_astro.html
discover the cosmos! Each day there is a different image or photograph of our fascinating universe, along with a brief explanation written by a professional astronomer.
Read morehttp://antwrp.gsfc.nasa.gov/apod/astropix.html
This site shows a daily image or video of different astronomy and space science with brief explanation.Read more
http://apod.nasa.gov/apod/
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