- In the Hipparchian, Ptolemaic, and
Copernican systems of astronomy, the
epicycle (from
Ancient Gr**** ἐπίκυκλος (epí****los) 'upon the circle',
meaning "circle...
-
standard epicyclic gearing.
Around 500 BC, the Gr****s
invented the idea of
epicycles, of
circles travelling on the
circular orbits. With this
theory Claudius...
- line to the right. A
given planet then
moves around the
epicycle at the same time the
epicycle moves along the path
marked by the deferent.
These combined...
- and the
other planets orbiting around it in
circular paths,
modified by
epicycles, and at
uniform speeds. The
Copernican model displaced the geocentric...
-
previously done by
Sandivogius of Czechel,
Brudweski added a
secondary epicycle to
explain the
motion of the Moon.
Brudzewski also
considered that the...
- For Kuhn, the
addition of
epicycles in
Ptolemaic astronomy was "normal science"
within a paradigm,
whereas the
Copernican Revolution was a
paradigm shift...
- the path of a
chosen point on the cir****ference of a circle—called an
epicycle—which
rolls without slipping around a
fixed circle. It is a particular...
- Archimedes, with
knowledge of
epicycles and eccentrics, and the
Antikythera mechanism also
appears to
presuppose eccentrics and
epicycles in the way it produces...
- 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...
-
sphere above it and the
sphere below. When
scholars applied Ptolemy's
epicycles, they
presumed that each
planetary sphere was
exactly thick enough to...
