ASTR 1101 Study Guide - Final Guide: Retrograde And Prograde Motion, Photon, Lunar Phase
Document Summary
Ancient uses: mythology/storytelling, calendar: stars are seasonal, navigation: polaris points north and gives latitude, constellations provide, the stars in a constellation are physically connected to each other, it is possible for a constellation to control the lives of people on earth longitude. Kepler: created a theoretical model to explain planetary motion, kepler"s (three) laws of planetary motion, first law = the orbit of every planet is an ellipse, with the sun at one of two foci, second law = planets move faster when they are closer to the sun, and slower when they are farther away, third law = the square of the period of a planet is proportional to the cube of the semi major axis of its orbit (p^2 = a^3, planets orbiting nearer to the sun have shorter periods than planets farther from the sun, mass of the planet has no effect, according to kepler"s second law, a planet with an orbit like the earth would:
