Table of Contents
- 1 What did Eudoxus discover in astronomy?
- 2 What is Eudoxus model of the universe?
- 3 What is the correct description regarding eudoxus planetary model?
- 4 What was Ptolemy’s model of planetary motion?
- 5 What was the complete planetary system of Eudoxus?
- 6 Why did Eudoxus add a fourth sphere to each planet?
What did Eudoxus discover in astronomy?
In two works, Phaenomena and Mirror, Eudoxus described constellations schematically, the phases of fixed stars (the dates when they are visible), and the weather associated with different phases.
What is Eudoxus model of the universe?
An astronomer named Eudoxus created the first model of a geocentric universe around 380 B.C. Eudoxus designed his model of the universe as a series of cosmic spheres containing the stars, the sun, and the moon all built around the Earth at its center.
What is contribution of Eudoxus in astronomy?
Eudoxus of Cnidus (NY duhs or kuh NY duhs) (400 B.C.?-350 B.C.?) was a Greek astronomer who made important contributions to the field of geometry. He is thought to have contributed to the theory of proportion that can be applied to irrational numbers, and he influenced astronomy with his theories on planetary motion.
What are the planets in Eudoxus planetary model?
The next spheres only pertain to the five planets (Mercury, Venus, Mars, Jupiter, and Saturn). The first sphere for the synodic period (here green).
What is the correct description regarding eudoxus planetary model?
Eudoxus’ model placed a spherical Earth at the centre of the universe. The Sun, planets, and stars were then placed in giant transparent spheres surrounding it. A model of the universe that has the Earth at the centre is known as a geocentric model of the universe.
What was Ptolemy’s model of planetary motion?
Ptolemy placed the Earth at the centre of his geocentric model. He believed that the Moon was orbiting on a sphere closest to the Earth, followed by Mercury, then Venus and then the Sun. Beyond the Sun were a further three spheres on which Mars, then Jupiter and then Saturn orbited the Earth.
What was Ptolemy’s theory about the solar system?
Model of the universe Ptolemy placed the Earth at the centre of his geocentric model. Using the data he had, Ptolemy thought that the universe was a set of nested spheres surrounding the Earth. He believed that the Moon was orbiting on a sphere closest to the Earth, followed by Mercury, then Venus and then the Sun.
What is Ptolemy model of the solar system explain?
In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under the geocentric model, the Sun, Moon, stars, and planets all orbit Earth.
What was the complete planetary system of Eudoxus?
The planetary system of Eudoxus is described by Aristotle in Metaphysics and the complete system contains 27 spheres. Simplicius, writing a commentary on Aristotle in about 540 AD, also describes the spheres of Eudoxus. They represent a magnificent geometrical achievement.
Why did Eudoxus add a fourth sphere to each planet?
To produce observed motions in latitude, Eudoxus added third spheres for each planet. So far, the planetary solutions followed the solutions for the Sun and the Moon. To produce the observed retrograde motions, Eudoxus added a fourth sphere.
How did Eudoxus explain the rotation of the stars?
He introduced a third sphere to correspond to the general motion of the planet against the background stars while the motion round the hippopede produced the observed periodic retrograde motion. The three sphere subsystem was set into a fourth sphere which gave the daily rotation of the stars.
How did eudoxus’theory of the Sun relate to lunar theory?
Eudoxus’ theory for the Sun was very similar to his lunar theory. The axis of the innermost sphere was inclined at a very small angle to the second, thus giving the Sun a deviation from the ecliptic.