天图投影上的圆

来自Shiyin's note
Shen（讨论 | 贡献）2013年12月19日 (四) 03:44的版本
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  • On the atioff projection map, how to draw a circle (e.g. telescope field of view)? suppose, telescope pointed at (Ra0,Dec0), FOV is a circle with radius R0
  1. Change the coordinate system from celestial to the designed coordinate (pole at Ra0,Dec0).
  2. Then the circle in the new coordinate system is simply DecP=90-R0
  3. change the new coordinate system back to celestial
  • [文件:Change cor.pro.txt]
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