The border of Western Australia meets the Northern Territory border and South Australian border at the 26th parallel south, at what is known as Surveyor Generals Corner.
This expedition, to determine 129° east on the ground, created world-wide scientific interest and involved the cooperation of the Astronomer Royal and the Royal Observatory, Greenwich, with wireless time signals sent by the French wireless Service, that were transmitted from the Lyons astronomical observatory (Observatoire de Lyon) at Saint-Genis-Laval, near Lyons, France, between 17 and 24 November 1920.
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In 1860 South Australia, which had been proclaimed a colony in 1836 (28 December 1836 - MAP), west to the 132° east, changed their western border from 132° east to 129° east (1860 - MAP).
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All of these boundaries meet at a single point, which is the easternmost point of the 127 metre section of the Western Australian border with the Northern Territory border which runs east-west along the 26th parallel south latitude to meet the western boundary of the South Australian border.