Chapters 21 review

in the Ptolemaic (Greek) model of the universe, the stars are attached to the ____

Celestial sphere

in the Ptolemaic (Greek) model of the universe, the

Earth was the center of the universe

this scientist was the first to use the telescope in astronomy

Galileo

the first modern astronomer to propose a Sun-centered universe was

Nicolaus Copernicus

the true shape of the planetary orbits was discovered by

Nicolaus Copernicus

the earth-centered system of the universe that was accepted for nearly seventeen centuries was presented in a treatise called the Almagest that was written by

Ptolemy

which of these men formulated the Law of Universal Gravitation

Sir Issac Newton

The belt of constellations through which all the planets move is called the

Zodic

when earth is farthest from the sun, its location is referred to as the ________ position

aphelion

the average distance from Earth to the sun is called the ___ unit

astronomical

The apparent path of the Sun upon the celestial sphere is called the

ecliptic

one of the discoveries which led to the modern view of the solar system was that the orbits of the planets are

ellipes

when earth is closest to the sun, its location is referred to as the ______ positon

perihelion

any variance in the orbit of a planet from its predicted is referred to as

perturbation

the apparent westward "drift" of the planets compared to the background star is called

retrograde motion

according to the Ptolemaic (Greek) model of the universe, how many "heavenly" bodies could be observed wandering along the background of stars?

seven

The ____ day is the time it takes for Earth to make one complete rotation with respect to a star other than our Sun

sidereal

the apparent shift in the position of a nearby star when viewed from extreme points in Earths orbit six months apart is called

stellar parallax

the period of time required for the Moon to complete a cycle is called the _____ month

synodic

the length of the daylight on the moon is about

two weeks