Measuring star positions, illustration. The device being used here is a quadrant, an instrument that is used to measure angles up to 90 degrees. Here, it is being used to measure the position of a star in the sky. This is determined by the angle it makes with the horizon. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / TIM BROWN |
Taille de l’image : | 4180 px × 4180 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |