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Updated: May 23, 2025
"We ought perhaps," says Herschel, "to look upon certain clusters of stars, and the destruction of a star now and then in some thousands of ages, as the very means by which the whole is preserved and renewed. These clusters may be the laboratories of the universe, wherein the most salutary remedies for the decay of the whole are prepared ." Philosophical Transactions for 1785, p. 217.
Herschel had, as we have seen, undertaken a revision of his father's "sweeps" for new objects, in those skies which are visible from our latitudes in the northern hemisphere. He had well-nigh completed this task. Zone by zone the whole of the heavens which could be observed from Windsor had passed under his review. He had added hundreds to the list of nebulae discovered by his father.
It may possibly have been an apparition of Halley's comet, following a course somewhat similar to that which it followed in the year 1835, when the perihelion passage was made on November 15, and the comet running southwards disappeared from northern astronomers, though in January it was 'received' by Sir J. Herschel, to use his own expression, 'in the southern hemisphere. There was an apparition of Halley's comet in the year 66, or seventy years after the Nativity; and the period of the comet varies, according to the perturbing influences affecting the comet's motion, from sixty-nine to eighty years.
But Herschel felt that this mighty task had to be supplemented by another of almost equal proportions, before it could be said that the twenty-foot telescope had done its work. It was only the northern half of the celestial sphere which had been fully explored.
After two, three or four hours' exposure, the photograph will show the fixed stars, but the planets, asteroids and comets will reveal themselves as a white streak of light, showing plainly where the sitters moved. Herschel had to watch each particular star in person, whereas the photographic lens will watch a thousand.
Finally, that indefatigable worker on meteors, A. S. Herschel, added to the number, and in 1878 gave a list of seventy-six coincidences between cometary and meteoric orbits. Cometary astronomy is now largely indebted to photography, not merely for accurate delineations of shape, but actually for the discovery of most of them.
After Sir William Herschel discovered Uranus, in 1781, it was found that astronomers had observed it on many previous occasions, mistaking it for a fixed star of the sixth or seventh magnitude. Altogether, nineteen observations of Uranus's position, from the time of Flamsteed, in 1690, had been recorded. In 1790 Delambre, using all these observations, prepared tables for computing its position.
Whewell has just published another book on the Principles of Morals, and also another on education, in which he cries up the geometrical processes in preference to analysis.... Yours very faithfully, J. HERSCHEL. The Prince and Princesse de Broglie came to Rome in 1845, and Signore Pellegrino Rossi, at this time French Minister at the Vatican, gave them a supper party, to which we were invited.
Will he insist that the rust is not rust, or that it is a rust sui generis, intentionally formed on the steel for some mysterious virtue in it, and that the staff and astrolabe of a shepherd-astronomer are identical with, or equivalent to, the quadrant and telescope of Newton or Herschel?
The telescope was, of course, in the open air, and as Herschel not unfrequently continued his observations throughout the whole of a long winter's night, there were but few women who could have accomplished the task which Caroline so cheerfully executed.
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