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Updated: May 21, 2025
This is the only known instance of a satellite circulating faster than its primary rotates, and is a circumstance of some importance as regards theories of planetary development.
And every morning they run forth to greet the sun, for on every high place a solar disc is made of cunning workmanship and as the sun rises the disc rotates with thundering noise, and all, both men and women, offer incense to the sun with censers in their hands. Such are their superstitious practices. And throughout the island, including all the towns there, live several thousand Israelites.
The fuel burns in the furnace, the water is superheated in the boiler, the steam is directed by the pipes, the piston is moved by the steam pressure, and the fly-wheel rotates because of proper mechanism between it and the piston.
When an autumn leaf parts on a still day from the twig, it often rotates and travels some distance from the tree, falling reluctantly and with pauses and delays in the air. It is conceivable that if the leaf were animated and could guide its rotation, it might retard its fall for a considerable period of time, or even rise higher than the tree.
But the earth is merely the fly-wheel without the engine. When the work by the tides withdraws energy from the earth, that energy is never restored. It, therefore, follows that the earth's rotation must be decreasing. This leads to a consequence of the most wonderful importance. It tells us that the speed with which the earth rotates on its axis is diminishing.
The swinging pendulum below it will not partake in its motion; and thus, through whatever arc the earth rotates from west to east, through the same arc will the plane of swing of the pendulum appear to travel from east to west under a b. But we cannot set up a pendulum to swing at the pole of the earth.
It is considered faulty piloting to make a pancake descent where there is ample landing space; in certain restricted areas, however, it is quite necessary to land in this way. A far more dangerous occurrence is the SIDE-SLIP. Watch a pilot vol-planing to earth from a great height with his engine shut off. The propeller rotates in an irregular manner, sometimes stopping altogether.
First, the spindle sleeve is integral with the governor yoke, and the whole rotates about a vertical stationary spindle, so that two motions are encountered a rotary motion and an up and down motion, according to the position taken by the governor. This spiral motion almost entirely eliminates the effect of friction of rest, and thereby enhances the sensitiveness of the governor.
The Sectio Canonis, which has come down under the name of Euclid, can, however, hardly be his in its present form. Accepting Heraclides's view that the earth rotates about its own axis, Aristarchus went further and put forward the hypothesis that the sun itself is at rest, and that the earth, as well as Mercury, Venus, and the other planets, revolve in circles about the sun.
While revolving, the cross rotates about its traveling center, A, in the opposite direction, the contact between the two circles being internal, and at a rate equal to that of the rotations of C and D, because the velocities of the axial and the orbital motion are to each other as f is to F, that is to say, as 1 is to 2.
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