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How long is a year?
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"Simple text and photos explain a year as a unit of time and Earth's orbit of the sun"-- |
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Theory of Orbits
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This textbook treats celestial mechanics as well as stellar dynamics from the common point of view of orbit theory making use of concepts and techniques from modern geometric mechanics. It starts wit… |
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Warriors of Ultramar (Ultramarines book 2)
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The Ultramarines are the epitome of a Space Marine Chapter. Warriors without peer, their name is a byword for discipline and honour, and their heroic deeds are legendary. The Great Devourer is descen… |
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