Proper noun
English Wikipedia has an article on:Astronomer RoyalWikipedia
Astronomer Royal (plural Astronomers Royal)
(Britain) An honorary title given to a leading astronomer; once the director of the Greenwich observatory.
As Astronomer Royal, Flamsteed spent some forty years observing and making meticulous records for his star catalogue, which would eventually triple the number of entries in Tycho Brahe 's sky atlas. Source: Internet
He and Astronomer Royal Frank Watson Dyson organized two expeditions to observe a solar eclipse in 1919 to make the first empirical test of Einstein ’s theory: the measurement of the deflection of light by the sun's gravitational field. Source: Internet
He appointed John Flamsteed as the first Astronomer Royal. Source: Internet
He held that office, as well as that of Astronomer Royal, until his death. Source: Internet
In 1782, he was appointed "The King’s Astronomer" (not to be confused with the Astronomer Royal ). Source: Internet
In the meantime Harrison's watch would have to be turned over to the Astronomer Royal for long-term on-land testing. Source: Internet