Royal Observatory Greenwich

The Royal Astronomical Observatory in Greenwich was founded in 1675. From the nineteenth century, it is known primarily for the fact that the meridian 0 passes through it, from which the longitude is measured. Currently, it houses a museum presenting astronomical and navigation tools. You can find here, among others the largest 19th-century Grubba telescope in Great Britain and Fedchenko's pendulum clock.

The observatory was established during the reign of Charles II. Originally, it housed instruments that the Royal Astronomer used when working on measurements necessary for navigation. With time, two solar clocks appeared in the observatory, thanks to which it was possible to determine the time precisely.

Officially, Meridian 0 was delineated and recognized in 1851. Symbolically, it was marked with a brass strip, which was later replaced by a stainless steel strip. At night, it is also illuminated by green laser light.