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Updated: June 6, 2025
Evidently, then, they depend upon the situation of the asteroid relatively to ourselves; and, so far, events lent countenance to M. André's eclipse hypothesis, since mutual occultations of the supposed planetary twins could only take place when the plane of their revolutions passed through the earth, and this condition would be transitory.
In the summer, however, the method is quite impossible, since, for some months, stars are not to be seen. No chronometer check could be applied until June 1915. On June 24 a series of four occultations were observed; and the results of the observations showed an error in longitude of a whole degree.
He alludes to his sister, and in his subsequent interview with the witch we gather a dreadful meaning concerning her fate. Her blood has been shed, not by his hand nor in punishment, but in the shadow and occultations of some unutterable crime and mystery.
The treatise of Albategnius on "The Science of the Stars" is spoken of by Laplace with respect; he also draws attention to an important fragment of Ibn-Junis, the astronomer of Hakem, the Khalif of Egypt, A.D. 1000, as containing a long series of observations from the time of Almansor, of eclipses, equinoxes, solstices, conjunctions of planets, occultations of stars observations which have cast much light on the great variations of the system of the world.
M. Oltmanns deduced in 1805 the whole of those observations which I marked for the Morro, at 5 hours 38 minutes 52.5 seconds 84 degrees 43 minutes 7.5 seconds west of the meridian of Paris. This longitude was confirmed by fifteen occultations of stars observed from 1809 to 1811 and calculated by M. Ferrer: that excellent observer fixes the definitive result at 5 degrees 38 minutes 50.9 seconds.
Figs. 21 and 22 show the arrangement of the apparatus, the principle of which is as follows: When the axis of the projector points toward the clouds, and in the direction occupied by a corresponding station, the occultations of the luminous source placed in the focus of the apparatus produce upon the clouds, which act as a screen, an alternate series of flashes and extinctions.
Even when an occultation is visible from both places, the times at which the star disappears from view will, generally speaking, be different. Much calculation is therefore necessary to decide the circumstances under which the occultations of stars may be visible from any particular station.
He was a plough-wright, a hard-working man, but of rare genius, who taught himself mathematics and astronomy in the evenings with wonderful success, for he knew the motions of the planets, calculated eclipses and occultations, was versed in various scientific subjects, and made excellent telescopes, of which I bought a very small one; it was the only one I ever possessed.
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