The Ptolemaic system is a geocentric cosmology, which assumed that the earth was stationary and at the center of the whole universe. It is important to remember, though, that even during Galileo's time, most people believed that the earth was the center of the universe and the sun rotated around our planet.
The expectation for the old civilizations was that the sun, moon, planets and stars were supposed to travel in an uniform motion. This motion was supposed to be a circle which was considered the closest to a perfect path for the heavenly bodies.
However, when studying the paths of those heavenly bodies, they could observe that, at least looking from Earth, the paths were not circular.
Therefore Ptolemy had a hypothesis that explained the <em>'supposed imperfection'</em>. In his model, he suggested that the apparently irregularity in the paths of the moons and starts were a combination of perfect paths (or circular motions) seen in perspective from the stationary body of the observer.
His suggestion was that, the planets were rotating around a center like the moon rotates the earth and they were doing this rotating movement around the earth like the moon rotates the sun fixed at Earth's rotation therefore giving us the illusion that they were not in a circular/perfect path.
So, in Ptolemy's system, Venus would rotate around our planet the same way that our moon rotates around the sun.
The part of the Constitution found in the executive branch would be “Article 2, section 1”. it states “The executive Power shall be vested in a President of the United States of America.”
They shaped the government by creating a constitution .
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In a year that seemed determined to shake Americans’ confidence in the foundations of their society, Kennedy’s death at 1:44 a.m. Pacific time on June 6, 25 hours after he was shot, was one of the biggest inflection points. Sirhan Sirhan’s bullets not only demolished the hope for a savior candidate who would unite a party so fractured that its incumbent, President Lyndon B. Johnson, had decided not to seek re-election. Coming just two months after the assassination of the Rev. Dr. Martin Luther King Jr., they also fueled a general sense — not entirely unfamiliar today — that the nation had gone mad; that the normal rules and constants of politics could no longer be counted on.
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These atoms will decay as the rock ages, and by measuring the ratio of radioactive isotopes within the rock, scientists can figure out how long it has been around. In 1913, geologist Arthur Holmes published “the Age of the Earth,” the first major effort to date the planet using radiometric dating.
