首页 > Term: pole-star recorder
pole-star recorder
An instrument used to determine approximately the amount of cloudiness during the dark hours. It consists of a fixed long-focus camera positioned so that Polaris is permanently within its field of view. The apparent motion of the star appears as a circular arc on the photograph and is interrupted as clouds come between the star and the camera.
0
创建者
- Kevin Bowles
- 50% positive feedback