The Moon 403
13.1 Description of the Moon 404
General Features 404
Surface Features 404
Origin of Lunar Surface Features 406
13.2 Structure of the Moon 409
Crust and Interior 409
The Absence of a Lunar Atmosphere 410
13.3 Orbit and Motions of the Moon 411
The Moon's Rotation 411
Oddities of the Moon's Orbit 412
13.4 Origin and History of the Moon 413
13.5 Eclipses 415
Rarity of Eclipses 416
Appearance of Eclipses 418
13.6 Tides 420
Cause of Tides 420
Solar Tides 422
Tidal Braking 423
13.7 Moon Lore 424
Project 427
Overview 6 The Solar System 429