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Chapter 4: Renaissance Astronomy

Aphelion
The point in the orbit of a celestial body when it is farthest from the sun.
Astronomical Unit (AU)
A unit–whose value is the average distance between the earth and the sun–used to measure great distances in space.
Eccentricity
A measure of the extent to which an orbit departs from circularity.
Ellipse
A closed, elongated curve that describes the shape of an orbit.
Foci
One of two points from which an ellipse is generated.
Greatest Elongation
The position of Mercury or Venus when it has the greatest angular distance from the sun.
Heliocentric
Sun in the center.
Impetus
The force or energy with which a body moves.
Inferior Planets
A planet whose orbit lies inside the earth’s orbit.
Kepler’s Laws of Planetary Motion
Three laws–discovered by Kepler–that describe the motions of the planets around the sun.
Major Axis
The axis of an ellipse that passes through both foci.
Perihelion
The point in the orbit of a celestial body when it is closest to the sun.
Semimajor Axis
Half of the major axis of an ellipse.
Sidereal Period
The time it takes for a planet or satellite to complete one full orbit about the sun or its parent planet.
Stellar Parallax
The shift in the direction of a star caused by the change in the position of the earth as it moves about the sun.
Superior Planets
A planet whose orbit lies outside the earth’s orbit.
Transverse Velocity
The part of the orbital speed of a body perpendicular to the sun between the body and the sun.
Universe
All the matter and space there is.

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Chapter 4: Renaissance Astronomy
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Aphelion
The point in the orbit of a celestial body when it is farthest from the sun.
Astronomical Unit (AU)
A unit--whose value is the average distance between the eart
2017-10-17 08:58:43
Chapter 4: Renaissance Astronomy
$ 13.900 2018-12-31
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