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Each night the planet appeared to lag a little behind the stars, in what is called prograde motion. Near opposition, the planet would appear to reverse and move through the night sky faster than the stars for a time in retrograde motion before reversing again and resuming prograde. Epicyclic theory, in part, sought to explain this behavior.
An example of a multiview orthographic drawing from a US Patent (1913), showing two views of the same object. Third angle projection is used. In third-angle projection , the object is conceptually located in quadrant III, i.e. it is positioned below and behind the viewing planes, the planes are transparent , and each view is pulled onto the ...
Paintoria, the Painting Planet - Its Artist is Pablo, The planet's name is a portmanteau of Paint and Victoria, or a pun on Pretoria. Paperia, the Paper Planet - Its Hero is Captain Paper, The planet's name is a pun on Paper. Drawopolis, the Drawing Planet - Its Creator is Sketch, The planet's name is a portmanteau of Draw and Metropolis.
The red curve is an epicycloid traced as the small circle (radius r = 1) rolls around the outside of the large circle (radius R = 3).. In geometry, an epicycloid (also called hypercycloid) [1] is a plane curve produced by tracing the path of a chosen point on the circumference of a circle—called an epicycle—which rolls without slipping around a fixed circle.
The word plastic draws from the Ancient Greek πλαστικός (plastikós), which means 'to mold' or 'to shape'. [3] It has long preceded its dominant modern meaning as a synthetic material . The term plastic arts has been used historically to denote visual art forms (painting, sculpture, and ceramics) as opposed to literature or music.
A planet is a large, rounded astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. [1] The Solar System has eight planets by the most restrictive definition of the term: the terrestrial planets Mercury , Venus , Earth , and Mars , and the giant planets Jupiter , Saturn ...
A planet is any object in orbit around the Sun with a diameter greater than 2,000 km. (Eleven votes in favor) A planet is any object in orbit around the Sun whose shape is stable due to its own gravity. (Eight votes in favor) A planet is any object in orbit around the Sun that is dominant in its immediate neighbourhood. (Six votes in favor) [48 ...
The two-body problem in general relativity (or relativistic two-body problem) is the determination of the motion and gravitational field of two bodies as described by the field equations of general relativity. Solving the Kepler problem is essential to calculate the bending of light by gravity and the motion of a planet orbiting its sun.