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9/28/2018 6:56 PM 774984 Coordinate systems - calc.zip
9/28/2018 6:56 PM 392066 The Moon and eclipses - calc.zip
9/28/2018 6:56 PM 264844 The planets comets and binary stars - calc.zip
9/28/2018 6:56 PM 243067 The Sun - calc.zip
9/28/2018 6:56 PM 414826 Time - calc.zip