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Heiskanen in 1936
Heiskanen in 1936
George Biddell Airy in 1891
George Biddell Airy in 1891
George Biddell Airy
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 meridi
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
The Prime Meridian in Greenwich (1884–1984); the telescope shown above left is behind the glass