Ptolemy

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.

The severed head of Pompey. Pompey was Caesar's rival in Rome-they had fought over the consulship of Rome. Pompey had sought refuge in Egypt. Confusingly both of Cleopatra's brothers/husbands were called Ptolemy. This was Ptolemy XIII.

Claudius Ptolemy was a Greek astronomer who lived in Alexandria, Egypt during the 2nd century CE. He is known for his work on astronomy and geography, including creating maps of the known world based on his observations and calculations.

Was he born in Rome? No, he was probably born in Egypt. However, at that time Egypt was part of the Roman Empire (as was everything from Egypt to Greece to Italy to Germany to England). He died in Alexandria, the city in Egypt at the mouth of the Nile

Was Ptolemy a Roman citizen? Almost certainly.

Ptolemy XIII was a pharaoh of Egypt who reigned during the late 1st century BC. He was a member of the Ptolemaic dynasty and co-ruled with his sister Cleopatra VII. Ptolemy XIII is best known for his conflicts with Cleopatra and his involvement in the civil war between her and Julius Caesar.

I do not think Ptolemy moved to Rome. Cleopatra lived there briefly as mistress of Julius Caesar, with full knowledge of Caesar's wife and the Roman people, but Caesar was so powerful and popular at the time that this indiscretion was tolerated. After Caesar's assassination, I think Cleopatra returned to Egypt. Her plans to revisit Rome as a conqueress, with her new husband Marc Antony, were thwarted at the Battle of Actium. Not sure what happened to Ptolemy XIII after Caesar replaced him with his sister Cleopatra.

the planets accurately. This is because Ptolemy's model relied on epicycles and deferents to explain the apparent retrograde motion of planets, which resulted in discrepancies with the observed phases over time. Copernicus later proposed a heliocentric model that offered a more accurate explanation for the phases of planets.

Retrograde motion is an optical illusion where a planet appears to move backwards in its orbit when viewed from Earth. This occurs due to the difference in orbital speeds between Earth and the observed planet. Modern understanding attributes retrograde motion to the relative motion and positions of the Earth and the observed planet as they orbit the Sun.

• When he saw that there were planets AND stars orbiting around earth.

Claudius Ptolemy, also known as Ptolemy, was a Greek-Roman mathematician, astronomer, and geographer who lived in the 2nd century AD. He is most famous for his work "Almagest," a comprehensive mathematical and observational treatise on astronomy that influenced Western and Islamic astronomy for over a thousand years. Ptolemy's geocentric model of the universe, with Earth at the center, dominated astronomy until the heliocentric model proposed by Copernicus in the 16th century.

Yes, Cleopatra did have slaves, as slavery was common in ancient Egypt. Slaves were used for various purposes such as household work, agriculture, and construction. Cleopatra would have likely had slaves to help maintain her palace and estate.

Ptolemy was an ancient Greek mathematician, astronomer, and geographer who made significant contributions to fields such as astronomy and geography. His greatest accomplishments include his geocentric model of the universe, known as the Ptolemaic system, and his work on mapping the stars and constellations in his book "Almagest." These works were foundational in shaping our understanding of the cosmos during antiquity.

Using his telescope, Galileo observed Jupiter over a period of months. He easily noticed the 4 largest moons. Which you can remember using this simple pneumonic device.

I. E.at G.reen C.atterpillars

Io, Europoa, Ganeimyde, and Callisto

Anyway, he observed these over a period of month, and sketched their movements every week or so, and eventually began to notice that they would disappear for a day or two, and then reappear on the other side of Jupiter. Logically they must have been orbiting around Jupiter.

This contradicted the Ptolemic model in which all objects in space orbited around the earth.

Ptolemy's full name is Claudius Ptolemaeus.

Ptolemy believed that Earth was the center of the universe, with the Sun, Moon, and other planets revolving around it in circular orbits. This geocentric model of the universe was the prevailing view in Western civilization for over a thousand years.

Claudius Ptolemy lived in the second century, A.D., at which time Rome was arguably the strongest empire in the world. In South Asia, many Hindu and Buddhist texts were committed to writing in the second century A.D.

Yes, Cleopatra's family, the Ptolemaic dynasty, was connected to many royal families through strategic marriages and political alliances. Cleopatra herself engaged in key relationships with Julius Caesar and Mark Antony as a means of solidifying her rule in Egypt and maintaining her position of power.

Copernicus proposed a heliocentric model, where planets revolve around the sun, while Ptolemy's geocentric model placed Earth at the center of the universe with planets orbiting around it. Copernicus' model helped to explain retrograde motion more simply than Ptolemy's epicycles.

The observed retrograde motion of planets led Ptolemy to add epicycles to Aristotle's system. Epicycles were small circles that planets moved in on their larger circular orbits around Earth in order to explain the appearances of retrograde motion.

Ptolemy's major contribution to trigonometry was his work on chords in a circle, which led to the development of the trigonometric functions sine, cosine, and tangent. He compiled a table of chords that facilitated trigonometric calculations and navigational measurements. Ptolemy's work influenced the development of trigonometry in the medieval Islamic world and later in Europe.

The main contribution for which Ptolemy is famous is his discovery that the earth revolved around the sun. This was known as the heliocentric theory (and it competed with Catholic Church teaching of the time, which held that the earth was the center of the solar system or geocentric).

Ptolemy was an ancient Greek astronomer and mathematician who made significant contributions to the fields of astronomy and geography. He is best known for his geocentric model of the universe, which dominated Western astronomy for over 1,300 years. Ptolemy's work also influenced later scientists and explorers, shaping our understanding of the world and the cosmos.

the market place was where people usually traded goods as they didn't have money. Things that might be traded include

doctor, harpist, vizier etc. services

food like grains, crops, fish

gold/jewelry

clothes

and lots more

Cleopatra was the last pharaoh of Egypt because she was defeated by the Roman Empire in 30 BC, which led to the annexation of Egypt as a Roman province. This marked the end of the Ptolemaic dynasty and the traditional pharaonic rule in Egypt.