the epicycle is not a linear function of the angle of the deferent. In the Hipparchian system the epicycle rotated and revolved along the deferent with...

backward in retrograde motion, and then again reversed to resume normal, or prograde, motion. The deferent-and-epicycle model had been used by Greek astronomers...

sphere/slice is the deferent, with a centre offset somewhat from the Earth; the other sphere/slice is an epicycle embedded in the deferent, with the planet...

retrograde motion was explained by having the planets travel in deferents and epicycles. It was not understood to be an illusion until the time of Copernicus...

calendar, this month is the fourth month of the year, beginning on 22 June and ending on 22 July. In Hindu astrology, Ashada begins with the Sun's entry...

of the planets, a system of deferents and epicycles was used. The planet was said to revolve in a small circle (the epicycle) about a center, which itself...

Mathematical Syntaxis (a.k.a. Almagest), Claudius Ptolemy used rotating deferent and epicycles that form epicyclic gear trains to predict the motions of the planets...

opposite to Earth from the deferent's center, known as the eccentric (represented by the × ). A planet or the center of an epicycle (a smaller circle carrying...

Greek concepts of deferent and epicycle in the Ptolemaic system of astronomy were related to Fourier series (see Deferent and epicycle § Mathematical formalism)...

apparent construction date of the mechanism—carried forward with more epicycles, and was more accurate predicting the positions of planets than the view...

Russell's teapot Deferent and epicycle § Bad science No true Scotsman Special pleading The Structure of Scientific Revolutions Proofs and Refutations "The...

is produced by a combination of a deferent and two epicycles. The centre of the first, and larger of the two epicycles, represented by the point e1 in the...

Jyēṣṭha begins on the new moon and is the third month of the year. Traditionally, Jyēṣṭha is associated with high summer, and corresponds to May–June in the...

glow of sunrise and sunset, and the aversion of misfortune and sickness in Hindu mythology. Asawin is the Thai variant of Ashvin and stands for the warrior...

Earth, Moon, Sun, planets and unseen "counter-earth" revolve around an unseen "Central Fire" was developed in the 5th century BC and attributed to the Pythagorean...

sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. From the perspective of an observer on Earth, the Sun's...

ভাদ Bhadô) is the sixth month of the Hindu calendar, which falls in August and September of the Gregorian calendar. In India's national civil calendar (Shaka...

it is called Bohag) and the Bengali calendar (where it is called Boishakh). This month lies between the second half of April and the first half of May...

and R. Kochhar suppose that the Vedanga Jyotisha was written in the period that it describes, and therefore propose an early date, between 1370 and 1150...

to explain the complex motions of the planets, a device known as deferent and epicycle first developed by Apollonius of Perga. Published in the Almagest...

theory of eccentrics and epicycles (and their deferents). This was further elaborated on by Hipparchus in the second century BC and, later, by Ptolemy in...

romanized: Nakṣatram) is the term for Lunar mansion in Hindu astrology and Buddhist astrology. A nakshatra is one of 27 (sometimes also 28) sectors...

axis and its orbital axis, which is the line perpendicular to its orbital plane; equivalently, it is the angle between its equatorial plane and orbital...

in an astronomic model to be replaced with an equivalent epicycle that moved around a deferent centered at half the distance to the equant point. Zij-i...

the planets are each governed by two epicycles, a smaller manda (slow) epicycle and a larger śīghra (fast) epicycle. It has been suggested by some commentators...

the morning. Devotees usually go to temples each morning and recite Thiruppavai by Andal and Thiruvempavai by Manikkavacakar. Hinduism portal Astronomical...

and Mihira were a father-son duo at Vikramaditya's court, and the poet Khana was Mihira's wife. This legend is of no historical value. "Varaha" and "Mihira"...

typically beginning in mid to late July and ending in late August. In the Tamil calendar, it is known as Āadi and is the fifth month of the solar year....

manipulating both negative and positive numbers, a method for computing square roots, methods of solving linear and quadratic equations, and rules for summing...

romanized: Caitra) is a month of the Hindu calendar. In the standard Hindu calendar and India's national civil calendar, Chaitra is the first month of the year....