volvelle
/vol-vel/US // ˈvɒl vɛl //
挥发,挥杆,挥发者,挥霍
Definitions
n.名词 noun
- 1
Astronomy.
- : a medieval instrument consisting of a series of concentric rotating disks, used to compute the phases of the moon and its position in relation to that of the sun.
Examples
The lunar phase volvelle can be seen through the circular opening at the back of the astrolabe.
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