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The amount an ellipse deviates from a perfect circle
Eccentricity
The shape of a planetary orbit
Ellipse
Planets move around the Sun in an ellipse with the Sun at 1 foci
Kepler's 1st Law
As a planet moves around its orbit, it sweeps out equal areas in equal times
Kepler's 2nd Law
Planets closer to the Sun have shorter orbital periods than planets further away
Kepler's 3rd Law
Point in a planets orbit where it goes the fastest
Perihelion
Point in a planets orbit where it farthest from the sun
Aphelion
distance from the center of one object to the center of the object orbiting it
orbital radius
The object being orbited in an orbital system
Primary
The object that is orbiting around another in an orbital system
Satellite
the point in the orbit of a satellite at which it is nearest to Earth
Perigee
the point in the orbit of a satellite most distant from Earth
Apogee
Based on the belief that the sun is the center of the solar system
Heliocentric
A model of the universe in which Earth is at the center of the universe
Geocentric
Any device that detects gravitational waves
Interferometer
an orbit of a satellite around a planet that is in the same direction as the rotation of the planet
prograde orbit
