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Astronomy - Ch 5 & 6 CP

Astronomy
Across
Glowing lights visible in the sky, resulting from processes in the Earth's upper atmosphere involving charged particles form the Sun and linked with the Earth's magnetic field.
The passage of a celestial body in front of another one that subtends a larger angle.
For Ptolemy, a small circle, riding on a larger circle called the deferent, on which a planet moves.
Abbreviation for the measure of the average distance from the Earth to the Sun.
One of the smooth areas of the Moon or on some of the other planets.
The fraction of incident light reflected by a body
The theory of the Earth's crust, explaining it as plates moving because of processes beneath. (2 words)
Lines of cliffs found on Mercury, Earth, the Moon, and Mars.
Down
Formulated 3 empirical laws of planetary motion.
The line between night and day on a moon or planet; the edge of the part that is lighted by the Sun.
The effect by which the atmosphere of a planet heats up above its expected equilibrium temperature because it is transparent to incoming visible radiation but opaque to the infrared radiation that is emitted by the surface of the planet.
The near point to the Sun of the orbit of a body orbiting the Sun.
Apparent motion of the planets when they appear to move backwards (from east to west) from the direction that they move ordinarily with respect to the stars.
Regions of high-energy particles trapped by the magnetic field of the Earth. (3 words)
Half the major axis for an ellipse. Half the longest diameter. (2 words)
A measure of the flatness of an ellipse.
Sun-centered
Earth centered
Advanced a heliocentric theory that explained retrograde motion as a projection effect.
Last great naked eye astronomer. Made very accurate observations of planetary positions.