Sundial. This time-keeping instrument indicates the time of day by means of a shadow cast on its surface,which is marked with hours. The shadow- casting marker is known as the gnomon. Tables are used to calculate standard time from the solar time that varies throughout the year | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Tek Image |
Taille de l’image : | 3752 px × 3754 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |