Introductory+treatise
11Lens (geometry) — In geometry, a lens is a convex shape comprising two circular arcs, joined at their endpoints. If the arcs have equal radii, it is called a symmetric lens.The corresponding shape is the lune. The Vesica piscis is one form of a symmetrical lens;… …
12Mathematical economics — Economics …
13Isaac Bonewits — Phillip Emmons Isaac Bonewits Isaac Bonewits in 2004 Born October 1, 1949(1949 10 01) Royal Oak, MI Died August 12, 2010 …
14Encyclopaedia Metropolitana — The Encyclopaedia Metropolitana was published in London, from 1817 to 1845, quarto, 30 vols., and was issued in 59 parts (22,426 pages, 565 plates).It professed to give sciences and systematic arts entire and in their natural sequence, as shown… …
15Mean anomaly — In celestial mechanics, the mean anomaly is a parameter relating position and time for a body moving in a Kepler orbit. It is based on the fact that equal areas are swept at the focus in equal intervals of time. The mean anomaly increases… …
16Eccentric anomaly — The eccentric anomaly is the angle between the direction of periapsis and the current position of an object on its orbit, projected onto the ellipse s circumscribing circle perpendicularly to the major axis, measured at the centre of the ellipse …
17Evection — (Latin for carrying away ), in astronomy, is the largest inequality produced by the action of the Sun in the monthly revolution of the Moon around the Earth.Evection causes the Moon s ecliptic longitude to vary by approximately 1.27 degrees, with …
18Equation of the center — The equation of the center, in astronomy and elliptical motion, is equal to the true anomaly minus the mean anomaly, i.e. the difference between the actual angular position in the elliptical orbit and the position the orbiting body would have if… …
19Variation (astronomy) — Variation in astronomy is used to refer to a perturbation of the orbit of a body, such as a planet or satellite.Specifically, in the case of the motion of the Moon around the Earth, the Variation is a type of perturbation caused by the action of… …
20Henry Crozier Keating Plummer — (October 24, 1875 – September 30, 1946) was an English astronomer.He was born in Oxford, the son of William Edward Plummer and nephew of the distinguished astronomer John Isaac Plummer. He gained his education at St. Edward s School and then… …
