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| In the 18 th century it was possible to open the window holding the southern pinhole, and, even in daylight, stellar transits were recorded and precisely timed with pendulum mechanical clocks. The accuracy of such clocks was better than 1 s per day, and the observations of stellar transits allowed their synchronization with sidereal time. The names of some bright stars are engraved on the meridian marbles in the positions that they had in 1702. Sirius, the brightest star, is near the number 161. Fig 1 Sun transits at the same altitude of Sirius as in 1702 ( Feb. 4, 2005 ) |
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