Japan 1949 – Hisashi Kimura
Hisashi Kimura (1870-1943) was a Japanese
astronomer and geodesist whose life’s work was on the
motion of the Earth’s poles of rotation. The main
component of polar motion is an oscillation with a period of
about 14 months called the Chandler wobble, but there is in
addition a smaller yearly variation established by Kimura in
1902 known as the z-term which is caused by the seasonal
displacement of air and water masses on the Earth. This stamp
depicting Kimura was released in the year of the 50th
anniversary of the Mizusawa Latitude Observatory, of which he was first director
(1899–1941).
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