Orbital Period Quotes

The squares of the periodic times are proportional to the cubes of the mean distances from the sun.

Planets move in ellipses with the Sun at one focus.

The word 'revolution' first brings to mind violent upheavals in the state, but ideas of revolution in science, and of political revolution, are almost coeval. The word once meant only a revolving, a circular return to an origin, as when we speak of revolutions per minute or the revolution of the planets about the sun.

The squares of the periodic times are to each other as the cubes of the mean distances.

The moon gravitates towards the earth and by the force of gravity is continually drawn off from a rectilinear motion and retained in its orbit.

Pluto has strong atmospheric cycles: it snows on the surface; the snows sublimate and go back into the atmosphere each 248 year orbit.

Generally speaking, exoplanets can be any size, and they are found in a wide range of orbits. Some have massive gas atmospheres; others are smaller with an icy or rocky composition.

You're going very fast when you're on orbit, going around the world once every hour and a half.

Because we were orbiting the earth faster than earth spins on its axis, we went around the earth 16 times a day, an earth day, which meant 16 periods of lightness and 16 periods of darkness in 24 hours. Every so often you'd look towards the earth, and often you could see lightness and darkness together, and dawn and sunset were spectacular.

The radius vector describes equal areas in equal times.

They have likewise discovered two lesser stars, or satellites, which revolve around Mars, whereof the innermost is distant from the center of the primary exactly three of his diameters, and the outermost five: the former revolves in the space of ten hours, and the latter in twenty-one and a half, so that the squares of their periodical times are very near in the same proportion with the cubes of their distances from the center of Mars; which evidently shows them to be governed by the same Law of Gravitation that influences the other heavenly bodies.

The star S0-2 orbits around Sgr A* every 16 years and will go through its closest approach in 2018. That's an opportunity to test Einstein's General Relativity theory through very precise measurements of this star's short period orbit.

The star next to Venus is Mercury … it has a similar orbit, but is by no means similar in magnitude or power. It travels in a lower circle, with a revolution nine days quicker, shining sometimes before sunrise and sometimes after sunset, but never more than 22 degrees away from the sun.

I am proud to find, from two astronomical observations, that Chapel Hill lies right in the orbit of Jupiter and his satellites, and that the period of his revolution is about twelve years.