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Ch 1 Intro Part 3

Vocabulary

TermDefinition
Revolve to orbit
Rotate to spin
Lunar Eclipse when a full Moon passes behind the Earth's shadow, darkening the Moon's surface
Solar Eclipse when a new Moon passes between the Earth and the Sun, blocking the Sun's light
Partial Eclipse when only part of the Sun or Moon is blocked from view
Aristotle ancient scholar who proved Earth is round from Earth's shadow on the Moon and supported Geocentrism
Total Eclipse when the Sun is entirely blocked from view (solar), or when the Moon turns red (lunar)
Annular Eclipse solar eclipse where the Sun's disk is not completely covered, leaving a ring of light
Umbra central, darkest region of a shadow cast by an eclipsing body
Penumbra outer, lighter region of a shadow cast by an eclipsing body
Triangulation used to determine distances based on geometry (trigonometry)
Baseline distance between two locations of observation, used to help determine how far away an object is
Parallax apparent motion of an object with respect to a distant background (stars) as the observer's location changes
Eratosthenes first person to calculate the Earth's circumference from the angles of shadows at different locations
Angular Diameter angle made between two opposite edges of an object as seen by an observer (apparent size)
Created by: john_bailey720
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