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...
35 KB (4,563 words) - 23:41, 8 July 2024
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...
75 KB (8,814 words) - 00:06, 18 July 2024
Epicycloid (section Area and Arc Length)
{R+r}{r}}\theta \right)} List of periodic functions Cycloid Cyclogon Deferent and epicycle Epicyclic gearing Epitrochoid Hypocycloid Hypotrochoid Multibrot...
7 KB (964 words) - 07:02, 30 May 2024
Russell's teapot Deferent and epicycle § Bad science No true Scotsman Special pleading The Structure of Scientific Revolutions Proofs and Refutations "The...
3 KB (293 words) - 18:12, 22 June 2024
Greek concepts of deferent and epicycle in the Ptolemaic system of astronomy were related to Fourier series (see Deferent and epicycle § Mathematical formalism)...
37 KB (4,733 words) - 18:28, 14 May 2024
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...
39 KB (4,778 words) - 02:49, 18 June 2024
Apparent retrograde motion (redirect from Apparent retrograde and direct motion)
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...
12 KB (1,566 words) - 12:16, 29 April 2024
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...
33 KB (4,185 words) - 03:24, 12 July 2024
Almagest (section Journals and magazines)
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...
43 KB (4,835 words) - 13:09, 17 July 2024
Ecliptic (section Equinoxes and solstices)
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...
27 KB (2,660 words) - 15:26, 25 June 2024
Equant (section Discovery and use)
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...
15 KB (2,066 words) - 14:40, 4 October 2023
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...
33 KB (3,102 words) - 03:41, 15 June 2024
Aryabhatiya (section Structure and style)
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...
17 KB (1,825 words) - 22:37, 28 March 2024
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...
4 KB (390 words) - 06:49, 17 June 2024
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"...
28 KB (3,349 words) - 23:24, 3 June 2024
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....
18 KB (1,931 words) - 06:16, 17 July 2024
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...
44 KB (5,784 words) - 22:54, 20 May 2024
quadrilateral Cycloid Epitrochoid Epicycloid Cardioid Nephroid Deferent and epicycle Ex-tangential quadrilateral Horocycle Hypotrochoid Hypocycloid Astroid...
47 KB (3,580 words) - 17:01, 29 June 2024
Jantar Mantar, Jaipur (category History of science and technology in India)
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...
21 KB (2,167 words) - 13:24, 17 June 2024
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...
29 KB (1,383 words) - 00:56, 8 July 2024
Hindu units of time (redirect from Ancient Vedic weights and measures)
Siddhanta etc. Sidereal astrology maintains the alignment between signs and constellations via corrective systems of Hindu (Vedic)-origin known as ayanamsas...
69 KB (5,795 words) - 14:33, 10 July 2024
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...
19 KB (2,587 words) - 16:03, 19 June 2024
Jantar Mantar, New Delhi (category Buildings and structures completed in 1724)
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...
11 KB (1,156 words) - 18:20, 21 July 2024
morning. Devotees usually go to temples early in the morning and recite Thiruppavai by Andal and Thiruvempavai by Manikkavacakar. Hinduism portal Astronomical...
4 KB (341 words) - 08:54, 22 December 2023
pañcāṅgam) is a Hindu calendar and almanac, which follows traditional units of Hindu timekeeping, and presents important dates and their calculations in a tabulated...
14 KB (1,901 words) - 14:59, 14 May 2024
Aristotelian physics (section Elements and spheres)
Ptolemy's deferent and epicycle model. Aristotle submits to the calculations of astronomers regarding the total number of spheres and various accounts give...
48 KB (6,187 words) - 14:46, 26 May 2024
Assamese: ভাদ) 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...
4 KB (295 words) - 19:09, 10 July 2024
apparent construction date of the mechanism—carried forward with more epicycles, and was more accurate predicting the positions of planets than the view...
127 KB (13,178 words) - 19:17, 12 July 2024
Epicyclic gearing (redirect from Epicycle gear)
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...
36 KB (5,301 words) - 09:59, 10 July 2024
\omega _{-}} and the modified cyclotron ω + {\displaystyle \omega _{+}} frequencies. These motions are similar to the deferent and epicycle, respectively...
15 KB (1,920 words) - 14:49, 12 July 2024