Kepler's First Law - ANSThe planets orbit the sun in eliptical paths with the sun at one focus
Kepler's Second Law - ANSthe orbital speed of a planet varies so that a line joining the sun and
the planet will sweep over equal areas in equal time intervals. the closer to the sun the planet is,
the faster it moves.
Kepler's Third Law - ANSMore distant planets orbit the sun at slower average speeds, obeying a
precise mathematical relationship. (p^2=a^3
Celestial Sphere - ANSImaginary globe where Earth is at the centre and provides an easy way
of describing position of objects in sky
Heliocentric System - ANSA model of the solar system in which Earth and the other planets
revolve around the sun.
Lunar Eclipse - ANSis a type of eclipse that occurs when the Moon passes directly behind the
Earth into its shadow. This can occur only when the Sun, Earth, and Moon are aligned during
the Full Moon phase.
Length of a Day - ANSVaries depending on latitude and season
Isaac Newton - ANSEnglish mathematician and scientist- invented differential calculus and
formulated the theory of universal gravitation, a theory about the nature of light, and three laws
of motion. was supposedly inspired by the sight of a falling apple.
Retrograde Motion - ANSThe apparent motion of the planets when they appear to move
backwards (westward) with respect to the stars from the direction that they move ordinarily.
the First Point of Aries - ANSstarting line of right ascension
Precession - ANSThe motion of a spinning body (as a top) in which it wobbles so that the axis of
rotation sweeps out a cone
Ocaam's Razor - ANS?
Coriolis Effect - ANSCauses moving air and water to turn left in the southern hemisphere and
turn right in the northern hemisphere due to Earth's hemisphere.
Zenith - ANSHighest point
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