日地距离=5000000÷0.018°×0.53°≈147222222(千米) 其中5000000千米为地球在远日点时要比它在近日点时远离太阳大约500万公里,0.018°为远日点时天上的太阳要比它在近日点时小了3.3%,约0.018°,0. ...
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