Orbital Dynamics Part 04 The Sun, the Moon, and the Earth Continued
Channel: Jon Toellner
Date: 2019-03-03

A basic course in Orbital Dynamics. Part 04 expands on Part 03 and explains how the ancients determined the relative sizes and distances of the Earth, Sun, and Moon.

0:00 Introduction
0:14 Eratosthenes Estimate of the Size of the Earth
2:02 Eratosthenes Geometric Construction in Geometer's Sketchpad
6:40 Eratosthenes Continued
8:16 The Reason for the Seasons
8:50 The Seasons
12:00 Incident Sunlight
12:30 Seasons and Ecliptic Simulator
14:49 Motions of the Sun Simulator
16:13 Precession of the Equinoxes and Changes in Earth Orbit
16:50 Hipparchus' Measurements of the Sizes of the Sun, Earth, and Moon
18:10 Hipparchus' Model in Geometer's Sketchpad
27:10 Hipparchus' Measurement of the Distance to the Moon
32:44 Earth/Moon Parallax
35:36 Earth, Moon, and Sun in Proper Perspective