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The Variation is the second-largest solar perturbation of the Moon's orbit after the Evection, and the third-largest inequality in the motion of the Moon altogether; (the first and largest of the lunar inequalities is the equation of the centre, a result of the eccentricity – which is not an effect of solar perturbation).
Variation (astronomy), any perturbation of the mean motion or orbit of a planet or satellite, particularly of the moon; Genetic variation, the difference in DNA among individuals or the differences between populations Human genetic variation, genetic differences in and among populations of humans
The Variation, discovered by Tycho Brahe, is a speeding-up of the Moon as it approaches new-moon and full-moon, and a slowing-down as it approaches first and last quarter. Its gravitational explanation with a quantitative estimate was first given by Newton.
In astronomy, the initial mass function (IMF) is an empirical function that describes the initial distribution of masses for a population of stars during star formation. [1] IMF not only describes the formation and evolution of individual stars, it also serves as an important link that describes the formation and evolution of galaxies. [1]
In the Hipparchian, Ptolemaic, and Copernican systems of astronomy, the epicycle (from Ancient Greek ἐπίκυκλος (epíkuklos) 'upon the circle', meaning "circle moving on another circle") [1] was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon, Sun, and planets.
The history of astronomy focuses on the contributions civilizations have made ... The Italian astronomer Geminiano Montanari recorded observing variations in ...
This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: [1] Intrinsic variables , whose luminosity actually changes periodically; for example, because the star swells and shrinks.
But because of the long period variations, his results are expected not to last more than a million years (and much less, maybe 1000 years only on very high accuracy). A major problem in any theory is that the amplitudes of the perturbations are a function of the masses of the planets (and other factors, but the masses are the bottlenecks).