Sun Clock Credits and Files [http://4physics.com/phy_demo/sunclock/SunClockCredits.html] - 2021-02-17 01:03:03 - public:stevetao Astronomy, Calculation, Physics - 3 | id:573867 -
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Mercury Day and Year - Zoom Astronomy [https://www.enchantedlearning.com/subjects/astronomy/planets/mercury/mercuryday.shtml] - 2021-01-15 07:35:13 - public:stevetao Astronomy, Calculation - 2 | id:485813 -
List of Free Science Books Online | Download free books legally [https://www.topfreebooks.org/list-of-free-science-books-online/] - 2019-01-03 03:48:06 - public:stevetao Astronomy, Chemistry, Free, Math, Physics, Science - 6 | id:230243 -