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Where is the Earth placed in the order of the planets?
地球在行星顺序中处于什么位置？
What objects in space do you know that have astronomical significance? Rank them in size from the smallest to the largest.
你知道空间中哪些物体具有天文学意义？请按从最小到最大的顺序排列它们。
What causes the phases of the Moon?
是什么导致了月相的出现？
What are the conditions for eclipses of the Sun? the Moon?
日食和月食发生的条件是什么？
What is meant by the "celestial sphere"?
‘天球’一词指的是什么？
What measurements are made to locate a star or constellation with respect to the celestial sphere?
为了确定恒星或星座相对于天球的位置，进行了哪些测量？
What is the ecliptic plane? What is its angle with respect to the celestical equator?
黄道平面是什么？它与黄赤交角是多少？
What is the origin of the seasons?
季节的成因是什么？
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