University:
Eastern Kentucky University
Course:
AST 135 | Introductory Astronomy
Academic year:

2023
Views:

174

Pages:

1
Author:

Shyanne Johnson

1 AU is equivalent to the ave. distance of the Earth from the Sun, which is equal to ____ 1.5 x 10^8 km or 150 M km A list of stars according ot their position, magnitude (brightness), and other properties A generalization of the first law, but it also gives us a way to define mass Newton's third law (Law of Interaction) A planetary model: Earth is the center of the universe; planets revolve around the Sun; the Sun, Moon, and stars revolve around the Earth Star Catalog A line of the ellipse that has similar length as the average distance of a planet from the Sun Semimajor axis A useful construct for describing locations of objects in the sky Celestial Sphere Tychonian Planetary Model An object that is accelerating free of any gravitational pull is essentially no different than the same object that is stationary but affected by gravity Ancient physics principle holding that the Earth is the natural center of all celestial spheres Aristotelian physics Equivalence Principle As Brahe did not have the ability to analyze his observational data of the planetary motions, he assisted Brahe and later developed laws based on those data Johannes Kepler Astronomers who significantly contributed to our understanding of how planets move around the Sun Tycho Brahe and Johannes Kepler As a planet approaches the Sun on its elliptical orbit and the distance to the spin center decreases, the planet ______ to conserve the _______. Similarly, when the planet is farther from the Sun, it moves more ______. Any change of momentum within the system must be balanced by another change that is equal and opposite so that the momentum of the entire system is not changed. Newton's third law (Law of Interaction) Astronomers which placed the heliocentric model of Copernicus on a sound mathematical basis Tycho Brahe and Johannes Kepler speeds up; angular momentum; slowly Brahe's book which contains a catalogue of 777 stars Astronomiae instauratae progymnasmata Brahe's catalogue was completed and later edited by Kepler with how many stars? 1004 fixed stars