An equatorial sundial is an ancient scientific equipment to tell time by using the shadow from solar projection. It consists of a sundial plate, a gnomon and a base.
赤道式日晷，是古人利用太阳投影测时的科学仪器，由晷盘、晷针和底座组成。
Finally, the method of equatorial horizon projection is used to analyze and calculate the sliding force and the resisting force in space.
最后运用赤平极射投影进行空间滑动力与阻抗的分析计算。
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