I'm almost positive that it is his discovering that the planets move in elipses (or ovals) rather than circles that he is most famous for, which Copernicus thought that they moved in circles when he came discovered that the sun was the center of our universe (A.K.A. the Heliocentric Universe).
http://en.wikipedia.org/wiki/Galileo_Galilei
the telescope!
my but
Math & astronomy.
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the major contribution of the scientist are their most important experiments they have done
Understanding Earth's history.
Robert Hooke discovered cell theory and cells
Math & astronomy.
the most important contribution of the Shang dynasty is writing.
her best contribution was science
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That's a really hard one to answer. If you are talking about historical or "famous" figures in astronomy, it would depend on the list provided. If you are talking about who made the latest contribution in general, well there are tons of papers constantly being published, so it will change frequently.
aristotle, copernicus, galileo
becouse she bj
The director
Writing
their alphabet
the major contribution of the scientist are their most important experiments they have done
Islam itself.