Passage de Vénus, Mission de Santa Cruz (Patagonie), Photograph Album 1903-1962
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Fleuriais, Georges-Ernest, 1840-1895.
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Transits of Venus are uncommon events, occurring only four times every 243 years, however in the eighteenth and nineteenth centuries, these rare events were of considerable practical importance to astronomers. Precise measurements of the timing and position of the planet as it passed across the disk of the sun offered the best means available to resolve one of the classic problems in observational astronomy: the determination of the distance from the earth to the sun, Th...
Académie des sciences (France)
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