Time ball,Royal Observatory,Greenwich,UK. This was the world's first public time signal. The time ball drops at exactly 13:00 GMT (Greenwich Mean Time) every day and is visible from the River Thames. It was introduced in 1833 by the then Astronomer Royal,John Pond | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Tafreshi, Babak |
Taille de l’image : | 3030 px × 4776 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |