George Biddell Airy
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Sir George Biddell Airy was an English mathematician and astronomer, as well as the Lucasian Professor of Mathematics from 1826 to 1828 and the seventh Astronomer Royal from 1835 to 1881. His many ach
George Biddell Airy in 1891
George Biddell Airy
Airy's Transit Circle in the Transit Circle Room of the Royal Greenwich Observatory; for a hundred years from 1884 to 1984, it marked the Prime meridian of the world, or more accurately, the Prime Meridian was marked by or derived from it.
The Prime Meridian in Greenwich (1884–1984); the telescope shown above left is behind the glass
IERS Reference Meridian
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The IERS Reference Meridian, also called the International Reference Meridian, is the prime meridian maintained by the International Earth Rotation and Reference Systems Service. It passes about 5.3 a
George Biddell Airy
…at Greenwich. This line, the fourth "Greenwich Meridian", became the definitive internationally recognised line in 1884. It was superseded by the IERS Reference Meridian in 1984, which runs approximately 102 metres to the east. In June 1846, Airy started corresponding with French astronomer Urbain Le Verrier over the…
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