Royal Observatory Greenwich

How astronomers including Nevil Maskelyne, fifth Astronomer Royal, helped solve the longitude problem.

The telescope has evolved as a key scientific instrument that has changed our perceptions of the world. 

The 88 constellations act as a handy map of the skies and a seasonal calendar used from ancient times. But what connects the stars in the same constellation?

It is a star, is it a planet or is it a plane? A handy guide to identifying that bright object you saw last night.

Everything you need to know to start you on the road to becoming an amateur or professional astronomer.

Why was Greenwich chosen as where east meets west at Longitude 0°?

With a telescope we can see billons of miles and travel effortlessly back billions of years in time.

The challenges of measuring everything from a fast-moving, wobbly platform through a haze.

How and, more importantly, why do we measure the brightness of stars?

Meridian astronomy is the meticulous surveying of the stars so that positions and movements of stars can be known accurately.