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Updated: June 6, 2025
This is to be 'accomplished by enclosing the upper part of the glass cylinders of the argand burner by a thin tube of tin or brass, which, when made to descend slowly before the flame, and then allowed suddenly to start back, will cause an occultation and reappearance of the light. The number of occultations denotes the number of the lighthouse.
I found that for taking observations for latitude and longitude by the sun the mercury horizon was satisfactory, but when occultations had to be taken at night the plate-glass horizons were easier to work, and gave a more clearly defined reflection of stars and planets in such a bitterly cold climate as Tibet, where astronomical observations were always taken under great difficulty.
"Cassini frequently observed Saturn, Jupiter, and the fixed stars, when approaching the moon to occultation, to have their circular figure changed into an oval one; and, in other occultations, he found no alteration of figure at all. Hence it might be supposed, that at some times and not at others, there is a dense matter encompassing the moon wherein the rays of the stars are refracted.
During the voyage of the 'Endurance' about fifteen months elapsed during which no check on the chronometers could be obtained by the observation of known land, and had no other check been applied there would have been the probability of large errors in the longitudes. For the purpose of checking the chronometers a number of observations of occultations were observed during the winter of 1915.
But their occultations result merely from the accident of their orbital planes passing through our line of sight; hence the heavens must contain numerous systems similarly constituted, though otherwise situated as regards ourselves, some of which, like Spica Virginis, will become known through their spectroscopic changes, while others, because revolving in planes nearly tangent to the sphere, or at right angles to the visual line, may never disclose to us their true nature.
As constructed originally, it was an arrangement by which a fixed light was alternately eclipsed and revealed. These recurrent occultations and revelations produce an effect totally different from that of the revolving light, which comes gradually into its full strength, and as gradually fades away.
That occultations of truth are just as certain as the aurora boreal is, and quite as easily accounted for. That men who will not shrink from the danger and toil of penetrating the polar basin, will shrink from the trouble of doing their own thinking, and put themselves, like Captain Poke, under the convoy of a God-like.
That's Talents, Incorporated information!" There was a fleet on the way to Kandar. It could not be said to be traveling in space, of course. If there had been an observer somewhere, he could not conceivably have detected the ships. There would be no occultations of stars; no blotting out of any of the hundreds and thousands of millions of bright specks which filled all the firmament.
They darkened the coral and the sands and the glistening sea growths just as a cloud temporarily darkens the landscape only the occultations and brightenings succeeded each other much more swiftly. We stared stupefied, our thinking power blurred by the incessent whirl of motion and noise. Suddenly Thrackles laughed aloud. "Seals!" he shouted through his trumpeted hands.
The principal difficulties of this method lie in the fact that comparatively few occultations occur, and those which do occur are usually of stars of the fifth magnitude or lower.
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