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   PR #    56
   Moon scatters solar X-ray. From the spectrum of bright part of moon we
   can get trum of dark part of moon, bright part of moon and sky with
   one another, cosmic Xn be estimated. Moon itself moves 12 degree in a
   day. Besides, due to the orbital motion of satelnges about 2 degree in
   an orbit. It is important to follow up moon by changing e.
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