All the discoveries will go into a catalogue that other observatories can then mine.

In 1887, the magnetographs registered the Riviera earthquake at these and several other observatories, the distribution of which is shown in Fig.

The building was begun in 1667 and finished in 1672; like other observatories of that time, it was quite unfit for use.

Nasa's Spitzer space telescope peered at the star for 21 days and, with data from other observatories, revealed a total of seven planets circling Trappist-1.

The result of this was immediately seen in the improved methods which he introduced at Greenwich, and which were speedily imitated at other Observatories.