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# REDIRECT Spherical astronomy
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# and Spherical
He was the Principal Investigator ( PI ) on the Spacelab 3 mission NASA Drop Dynamics ( DDM ) experiments, PI on the NASA SPAR Flight Experiment # 77-18 " Dynamics of Liquid Bubble ," PI on the NASA SPAR Flight Experiment # 76-20 " Containerless Processing Technology ," and PI on the Department of Energy Experiment " Spherical Shell Technology.
# and astronomy
The Armillary sphere # History | spherical astrolabe, long employed in medieval Islamic astronomy, was introduced to Europe by Gerbert d ' Aurillac, later Pope Sylvester II.
The increasing use of radio frequencies for communication makes astronomical observations more and more difficult ( open spectrum # Radio astronomy needs ).
# Sullarat Haunãnãyã ( Ascent of the Mind ), a treatise on astronomy and cosmography, edited and translated by F. Nau ( Paris, 1899 )
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