Puzzler 4 (1, 2, 3) You're standing on the moon. Directly overhead is the Earth. How long will it take the Earth to reach the horizon? Explore the Moon | Lunar Puzzlers | Last Man on the Moon Hear the Space Pioneers | Origins | Resources Transcript | Site Map | To the Moon Home E-mail | TV Schedule | Web Schedule | Teachers Previous Sites | Search | Site Map | Shop | Printable page PBS Online | NOVA Online | WGBH ©