00283nam a2200121Ia 45000030006000000080041000060400015000471000017000622450026000792600027001055460012001320050017001440STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aMallik, D.N.  aElements of Astronomy  bUniversity pressc1921  aEnglish20220125170006.0