The working projection plane is taken at the equatorial plane corresponding to the ground surface.
工作投影面为赤道平面―相当于地平面。
2
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。
3
Finally, the method of equatorial horizon projection is used to analyze and calculate the sliding force and the resisting force in space.