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...

{R+r}{r}}\theta \right)} List of periodic functions Cycloid Cyclogon Deferent and epicycle Epicyclic gearing Epitrochoid Hypocycloid Hypotrochoid Multibrot...

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

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

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...

Apollonius of Perga (c. 262 – c. 190 BC) had introduced the deferent and epicycle and the eccentric deferent to astronomy. Hipparchus (2nd century BC) had crafted...

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...

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...

against the background of stars. The ecliptic is an important reference plane and is the basis of the ecliptic coordinate system. The ecliptic is the apparent...

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...

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...

moon and is usually the fourth month of the year. Rath Yatra that is dedicated to Jagannath is held in the month of Asadha every year in Puri and other...

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....

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...

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...

quadrilateral Cycloid Epitrochoid Epicycloid Cardioid Nephroid Deferent and epicycle Ex-tangential quadrilateral Horocycle Hypotrochoid Hypocycloid Astroid...

features the world's largest stone sundial, and is a UNESCO World Heritage Site. It is near City Palace and Hawa Mahal. The instruments allow the observation...

of Rohini, his father-in-law cursed him with leprosy and proclaimed that the Moon would wax and wane each month. The Nakshatras are also alternatively...

Siddhanta etc. Sidereal astrology maintains the alignment between signs and constellations via corrective systems of Hindu (Vedic)-origin known as ayanamsas...

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...

observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Some of these purposes nowadays would...

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

Ptolemy's deferent and epicycle model. Aristotle submits to the calculations of astronomers regarding the total number of spheres and various accounts give...

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

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...

\omega _{-}} and the modified cyclotron ω + {\displaystyle \omega _{+}} frequencies. These motions are similar to the deferent and epicycle, respectively...

pañcāṅgam) is a Hindu calendar and almanac, which follows traditional units of Hindu timekeeping, and presents important dates and their calculations in a tabulated...

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...