[3] Stokes G H,Braun C,Sfidharan R,et al.The Space-Based Visible Program[J].Lincoln Laboratry Journal,1998,11(2):205-238
[6] Mullins L D.Calculating Satellite Umbra/Penubm Entry and Exist Positions and Times[J].The Journal of the Austronantical Science,1991,39(4):411-422
