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ASTR Key Terms 1

Professor Lubell Astronomy Chapters 1-7

Rotation Axis Any imaginary line through the center of a body about with the body spins.
Celestial Sphere An imaginary sphere surrounding the Earth, representing the sky. Ancient astronomers pictured celestial objects as attached to it.
Horizon The Line Separating the sky from the ground
Cosmic Horizon The maximum distance one can see out into the universe at a given time. The horizon lies at a distance in lightyears approximately equal to the age of the universe in years.
Model A theoretical representation of some object or system
Constellations A grouping of stars on the night sky. Astronomers divide the sky into 88 constellations.
Celestial Poles An imaginary point on the celestial sphere directly above the Earth's North of South poles.
Created by: Nerdist