Ptolemy

There were TONS of them, but Cleopatra was probably the most famous of them all.

Cleopatra was married to her younger brother, Ptolemy XIII, for about one year from 51 BC to 47 BC. Their marriage was part of the tradition of sibling marriages in the Ptolemaic dynasty to maintain royal power.

The difference between Ptolemy's and Copernicus's model was that, Ptolemy's model had the Earth in the middle of the Solar System, with all the other planets (including the Sun and the moons) revolving around it. In Copernicus's model, he had the Sun in the center of the Solar System.

Some said he drowned in the river of NILES, and some say he died of a certain disease. Nobody is sure because history can end up in lots of possibilities.

No, Ptolemy's model of the universe did not exclude reference to heaven. Ptolemy's geocentric model included the concept of celestial spheres, with the outermost sphere considered to be the realm of the fixed stars or heavens.

Read the book. No one should tell the answer here.

If you mean Claudius Ptolemaeus, no. He lived about 1900 years ago.

Both models explain it simply, and even a simple model with circular orbits explains it easily. Normally, as the planets rotate round the Sun, they appear to move along the ecliptic from west to east. But in the short period around opposition, when the planets are opposite the Sun in our sky, and we are closest to them, they appear to move east to west because they are going round more slowly than us - we are overtaking them. That is retrograde motion.

The Ptolemaic is based on the Greek philosophy that all the objects in the sky must follow circular motion in one form or another. With the Earth supposed at the centre, the planets' movements were quite complicated and each planet needed a good number of epicycles.

The idea of epicycles is that you have a large circle (the deferent) and then a small circle (the epicycle) whose centre moves round the deferent. Then the planet travels round that epicycle.

Extra epicycles were required to represent what we now know as the planets' elliptical orbits and the inclination of the orbits to the ecliptic.

The basic idea of the deferent and epicycle is easily explained in terms of Venus's orbit. We now know that with the Sun at the centre, Venus and the Earth travel round circular orbits in 225¾ and 365¼ days with radii of 1.000 units for the Earth and 0.723 units for Venus (we are assuming circular orbits to make the example easier). This is the basis of the Copernican heliocentric model.

If you choose to consider the Earth is at the centre, this motion is exactly replicated by having a deferent with radius of 1.000 units round the Earth, and on it is an epicycle with its centre going round in 365¼ days. The epicycle has a radius of 0.723 units and Venus travels round the epicycle in 225¾ days. This is the basis of Ptolemy's model (in the Ptolemaic model the Sun also went round the Earth in 365¼ days, but at a larger radius beyond the 'sphere' of Venus).

Both these models represent the position of Venus as seen from the Earth with equal accuracy. That is still the case when the extra epicycles are added for ellipticity, inclination et cetera.

So the issue between the Ptolemaic model (geocentric) and the Copernican model (heliocentric) was not accuracy but whether the Earth or Sun was at the centre. There was no way at that time of deciding which was correct, but Copernicus's model did not have such violent motion of Venus, which was one reason Galileo preferred it.

Eventually Kepler came up with an alternative system, and that is the one used today, because it is backed up by later theoretical discoveries of the law of gravity and the laws of motion.

Im thinkin that it was made when he decided to look up at the sky one night and decided he would make an astronomical observation. idk just that's how i would make an oservation of the sky.

[Rosco P. Coltrain]

Ptolemy was a Greco-Roman scholar who lived in the 2nd century AD. He is most famous for his work in astronomy, geography, and astrology, particularly his treatise "Almagest" which was a groundbreaking work on the motions of celestial bodies.

Ptolemy, the astronomer and mathematician, did not receive any awards during his lifetime. However, he is remembered and honored through various posthumous recognitions and awards for his contributions to the field of astronomy, particularly for his work on the "Almagest" and his geocentric model of the universe.

Ptolemy Elrington is a British artist known for creating sculptures from discarded hubcaps and other found objects. He transforms these materials into intricate animal and insect shapes, showcasing his creativity and commitment to recycling and environmental awareness through his art.

Ptolemy called the transparent spheres in his geocentric theory "celestial spheres." He believed that these spheres carried the celestial bodies, such as the planets and stars, in circular motion around the Earth.

They were boyhood friends, but Ptolemy was a cautious person, whereas Alexander had more vision and passion.

Ptolemy became one of Alexander's Companions (a group of soldiers who he had grown up with and followed him on his journeys later on) After Alexander's death, Ptolemy quickly obtained control of Egypt. His family reigned in Egypt, until his last remaining descendant, Cleopatra, committed suicide.

Aristarchus was a Greek astronomer who theorized that the Earth rotated on its axis and revolves around the sun. None of his work has ever been discovered, but his ideas live on today and are the basis for many astronomical theories.

well the piri reis map was created in 1929 and as for the ptolemy's map i am currently unable to find the creation date for it so the ptolemy's map came first because i am on a quiz and my teacher says it came first.

Because plain circular orbits could not explain the way the planets move. The philosophers said that the circle was the perfect curve, and Ptolemy's model used circles and epicycles.

An epicycle is a small circle whose centre travels round a larger circle, and the planet then travels round the epicycle. Extra epicycles were added to account for things like the eccentric orbits (which are now recognised as elliptical), and the inclination of the orbits.

However Ptolemy's model represented the movements of the planets pretty accurately which is why no-one thought to challenge it for 1400 years. Ptolemy's model was also in use in planetariums until modern times, when computer driven planetariums took over.

In Ptolemy's model both Venus and Mars have very large epicycles, which we now understand are there to account for the Earth's movement round the Sun.

Claudius Ptolemy worked in Alexandria, Egypt during the second century AD. He was a Greco-Roman mathematician, astronomer, and geographer known for his influential works on astronomy and geography.

Aristotle said the earth was in the center.

Ptolemy supported Aristotle and added to it.

Copernicus said the sun was in the middle.

Galileo also said the sun was in the center and added to Copernicus.

Claudius Ptolemy developed the mathematical astronomy used in Christian and Muslim countries up until the 16Thcentury.

Christopher Columbus and Magellan used Ptolemy's version of the world map during their voyage, but they did not know it was incorrect, thus not ending up where they planned to be.

He found the position of over one thousand stars.

Yes, Ptolemy, the ancient Greek mathematician, astronomer, and geographer, is believed to have been married and had at least one daughter. However, historical records about his personal life are limited, so details about his marriage are not well-documented.

Ptolemy's model of the Solar system accounted for retrograde motion by using a system of epicycles and deferents. The epicycles were smaller circles within larger deferents that allowed for the planets to move backwards temporarily. This complex system of circular motions aligned with the observations but was eventually found to be inaccurate.

The people who gave birth to him.

If you want more info go and ask him.

In Ptolemy's geocentric model, the deferent was a large circle centered on the Earth that carried the center of a smaller circle called the epicycle, where the planets moved. The equant was a point near the center of the deferent where the planet's motion appeared uniform. By incorporating these features, Ptolemy could account for the irregularities in the motion of the planets as observed from Earth, while still preserving the idea of circular orbits as proposed by Aristotle.