Veikko Aleksanteri Heiskanen
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Veikko Aleksanteri Heiskanen was a Finnish geodesist and geophysicist. He was known for his refinement of George Biddell Airy and John Henry Pratt's theories of isostasy into his own, the Heiskanen hy
Heiskanen in 1936
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