Geocentric a. \end{array}% Claudius Ptolemy (about 85165 CE) lived in Alexandria, Egypt, a city established by Alexander the Great some 400 years before Ptolemys birth. Ptolemy also attempted to place astrology on a sound basis in Apotelesmatika (Astrological Influences), later known as the Tetrabiblos for its four volumes. c. exceeding the escape velocity. You are a home health nurse who is seeing T.H. planets change the direction in which they move across the night sky. c. Mercury and Venus The comet's speed is greatest when it is nearest the Sun. Under its Greek rulers, Alexandria cultivated a famous library that attracted many scholars from Greece, and its school for astronomers received generous patronage. Which equation represents the relationship of the planet's period to its semimajor axis in data shown in the figure below? 11. Let us know if you have suggestions to improve this article (requires login). They write new content and verify and edit content received from contributors. e. eccentricity. e. Mars, Jupiter, and Saturn. He introduced retrograde motion. a. Nicolaus Copernicus \end{aligned} \begin{array}{ccc} Newton's first law states that objects in motion, stay in motion unless acted upon by an unbalanced force, Astronomy 7,8,9,10,11 (Check your understandi, AST1002 Chapter 5 - Astronomy in Action Video, Abe Mizrahi, Edward E. Prather, Gina Brissenden, Jeff P. Adams, Jeffrey O. Bennett, Mark Voit, Megan O. Donahue, Nicholas O. Schneider, Exercise Biochemistry S2L6 - Diet and substra, EXAM 3 - Biocompatibility, Thrombosis, and Fl. In this work he proposed what is now called the Ptolemaic systema unified system in which each heavenly body is attached to its own sphere and the set of spheres nested so that it extends without gaps from Earth to the celestial sphere. Ptolemy | Accomplishments, Biography, & Facts | Britannica Please refer to the appropriate style manual or other sources if you have any questions. a. spend most of its time near the Sun. HW 3 Astronomy Flashcards | Quizlet d. He introduced READ: Claudius Ptolemy (article) | Khan Academy Ptolemy credited Hipparchus (mid-2nd century bce) with essential elements of his solar theory, as well as parts of his lunar theory, while denying that Hipparchus constructed planetary models. d. stay in motion unless acted upon by an unbalanced force. WebPtolemy used epicycles to explain the retrograde motions of planets. 17.8 AU e. epicycles of Mars, 41. a. The largest sphere, known as the celestial sphere, contained the stars and, at a distance of 20,000 times Earths radius, formed the limit of Ptolemys universe. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. The comet's speed is greatest when it is farthest from the Sun. b. The eccentricity of the majority of the planetary orbits in our Solar System is approximately Which of the following are the inferior planets? The average distance between a planet and the Sun is given by the _________ of its elliptical orbit. 36. Scientists had no way to explain retrograde motion.