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Updated: May 17, 2025
That the Babylonians had such a system as is here outlined is confirmed by Diodorus Seculus. The position of Nibir, or Jupiter, whose course keeps closer to the ecliptic than that of any other planet, served as an important guide in calendrical calculations.
Alien body bearing zero-one-five, one-point-seven degrees over plane of the ecliptic. On intersecting orbit. Change course two degrees, hold for fifteen seconds, then resume original heading. Will compensate for change nearer destination!" Roger watched the scanner a moment longer.
He searched along the shore and found the dead body of the captain, and a piece of splintered spar seven or eight feet long, on which the cabin boy had come ashore. The 'Ecliptic', with her cargo and crew, had completely disappeared, while the signalman, near at hand, slept peacefully, undisturbed by her crashing timbers, or the shouts of the drowning seamen.
He imagined that the two smaller stars would reappear, in consequence of the supposed revolution of the planet round its axis; but the discovery of the ring of Saturn, and of the obliquity of its plane to the ecliptic, was necessary to explain the phenomena which were so perplexing to our author.
For several years I petitioned annually for outfit and transportation to Scilly Islands, on the Ecliptic Circle, where I purposed to develop my scheme of transferring a portion of our globe to the system of Orion.
He anticipated a planet between Mars and Jupiter too small to be seen; and his inference that the obliquity of the ecliptic was decreasing, but would, after a long-continued diminution, stop, and then increase again, afterwards acquired the sanction of demonstration.
So instead of following book procedure, relaying the dope to Tom on the control deck to pass it on to Astro, I'd just sing out to Astro direct on the intercom, 'Give me an upshot on the ecliptic! or 'Give me a starboard shot! and Astro would come through because he knows I always know what I'm talking about." "Not always, hot-shot!" growled Astro.
It will be seen that a very satisfactory accordance exists between the elements of the position of the invariable plane for the two epochs. Diminution of the obliquity of the ecliptic. The astronomers of the eighteenth century had found, by a comparison of ancient with modern observations, that the obliquity of the ecliptic is slowly diminishing from century to century.
They determined the circumference of the earth by a method identical with that which would be employed by modern astronomers; they ascertained the position of the stars by right ascension and declination; they knew the obliquity of the ecliptic, and determined the place of the sun's apogee as well as its mean motion.
In time even these observations were excelled, and it now appears certain that the Chaldæans recognized the annual displacement of the equinoctial point upon the ecliptic, a discovery that is generally attributed to the Greek astronomers. But, like Hipparchus, they made faults of calculation in consequence of the defects of their instruments. It was the same with the moon.
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