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Updated: May 17, 2025
"He determined," says Delambre, "the position of the stars by right ascensions and declinations; he was acquainted with the obliquity of the ecliptic.
At this rate of precession, which modern, calculation has confirmed, it requires 71 2-3 years for the Cardinal points to pass through one degree on the Ecliptic, and 2150 years through thirty degrees, or one sign of the Zodiac.
We have, however, distinct records of two such spheres used by the Chinese about 2500 B.C. Gnomons, or some kind of sundial, were used by the Egyptians and others; and many of the ancient nations measured the obliquity of the ecliptic by the shadows of a vertical column in summer and winter.
They were all in a straight line, and parallel to the ecliptic, and appeared brighter than other stars of the same magnitude. Believing them to be fixed stars, he paid no great attention to their distances from Jupiter and from one another.
I think it would be true to say it was Linnaeus who set the world on its present twist of thinking, and levered our mental globe a little more perpendicular to the ecliptic.
By now she was speaking fairly well. "They are stars!" Then: "They don't look the same. They're not outlined in the same way as I know. But they can't be anything else!" What did it mean? "Look" showing her the constellation Leo, on the ecliptic, and therefore visible to both the northern and southern hemispheres "do you recognise that?" "Yes," decisively.
To resume: "Beginning of eclipse, 1 A. M. Ecliptic opposition, in 4 y. 6 m. 12 d. 9 h. from beginning of eclipse. Middle, in 4 y. 9 m. 0 d. 7 h. 9 m. from beginning of eclipse. End of eclipse, 9 y. 11 m. 20 d. 3 h. 2 m. from beginning. Period of occultation, 9 y. 7 m. 26 d. 4 h. 16 m. 2 s." I gazed at the brigadier in admiration and awe.
"They could still do a lot of damage if they hit that ship," asserted Tom. "And how do you expect to aim them?" demanded Connel. "There's not enough juice in the batteries to steer them!" "We'll just fire them straight ahead, sir," broke in Roger. "Look!" he continued, pointing to the scanner screen. "Devers' ship is just circling us now. And he's on the same plane of the ecliptic.
Moreover, his axis lies almost exactly on the plane of the ecliptic, so that we could choose a waiting place on his orbit where the line of his axis lay in the direction of his motion, and simply descend on one of his poles, at which the stationary atmosphere would not whirl the car, and where we might also profit by an ascending current of air.
Arzachel explained this supposed phenomenon by assuming that the equinoctial points, or the points of intersection of the equator and the ecliptic, revolve in circles of eight degrees' radius. The first points of Aries and Libra were supposed to describe the circumference of these circles in about eight hundred years.
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