What is simply shadow effects that were first understood by the early Greeks.
100
Who constructed a model of the solar system that put the sun at the center, but used circular orbits for the planets?
What is Nicolous Copericulas.
100
What lies at the center of our solar system?
What is the sun.
200
What is an orbit?
What is the path of an object as it goes around another object in space.
200
During what solstice in the Northern Hamisprher are sun's vertical rays located at the Tropic of Cancer.
What is summer solstice.
200
What is a solar eclipse?
What is the moon moves in a line directly between Earth and the moon.
200
Who was a precise observer for twenty years, sxpecially of Mars?
What is Tyche Brake.
200
What is rotation?
What is the turning on one's axis.
300
What is retrograde?
What is planets exibit an apparent westward drift which occurs as Earth overtakes another planet.
300
During what solstice in the Northern Hamisprher are sun's vertical rays located at the Tropic of Capricorn.
What is winter solstice.
300
When do solar eclipses occur?
What is only during the new moon stage.
300
Who had their planets appear as disks?
What is Galileo.
300
What is the approximate time it takes Earth to rotate on it's axis.
What is 24 hours.
400
What are deferents and epicycles?
What is large orbital circles and small circles.
400
During what equinoxs in the Northern Hamisphere are sun's vertical rays located at the Equator.
What is Autumnal Equinox and spring (vernal) equinox.
400
When do lunar eclipses occur?
What is only during the new moon phase.
400
What laws says planets revolve around the sun at varying speeds and planets sweep out equal areas in the same amount of time?
What is Kepler's law.
400
What is the most important accomplishment of the Appolo moon missions?
What is moon landing and samples.
500
What is revolution?
What is the motion of a body, such as a planet or moon, along a path in space.
500
What is it called when the axis is always pointed in the same direction?
What is parellism.
500
How do eclipses take place?
What is the moon must be in the plane of the ecliptic at the time of new-or full-Noon phase.
500
What law said there is a proportianal relation between a planet's orbital period and its distance to the sun and the planet's orbital period squared is equal to its mean solar distance cubed?
What is the Harmonic law.
500
DOUBLE JEOPARDY!
Approximately how long does it take for the moon to go through all of it's phases?