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Updated: May 10, 2025
A younger branch of the Perseid family reigned in Lacedæmon—Eurystheus, to whom Hercules was subject; but he, with all his sons, lost their lives in battle, so that the Perseid family was represented only by the sons of Hercules—the Heracleids, or Heraclidæ. They endeavored to regain their possessions, and invaded the Peloponnesus, from which they had been expelled.
For this reason, Leverrier pronounced, in 1867, the Perseid to be of older formation than the Leonid system. He even assigned a date at which the introduction of the last-named bodies into their present orbit was probably effected through the influence of Uranus.
In other words, the application of the proper correction for the terrestrial movement, and the effects of attraction by which each individual shooting-star is compelled to describe a hyperbola round the earth's centre, reduces the extended line of radiants to a compact group, with the cometary radiant for its central point; the cometary radiant being the spot in the sky met by a tangent to the orbit of the Perseid comet of 1862 at its intersection with the orbit of the earth.
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