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27 Cards in this Set
- Front
- Back
The geocentric theory claims that the _______ is at the _______ of the universe.
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earth, center
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path among the stars that the sun appears to follow
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ecliptic
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a line between the sun and planet will cover equal areas during any equal orbital time
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Kepler's second law of planetary motion: law of areas
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Earth's orbit around the sun
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revolution
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planet's circular, slightly off-center orbit
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eccentric
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During summer in the northern hemisphere, which way is the North Pole tilted?
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towards the sun
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number of degrees Earth's axis is tilted
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23 1/2 degrees
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the force holding planets in their orbits
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gravity (law of gravitation)
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English mathematician and scientist who formulated the law of gravitation
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Sir Isaac Newton
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first person to use a telescope for astronomy
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Galileo Galilei
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time required for a planet to orbit the sun is proportional to its distance from the sun
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Kepler's third law of planetary motion: period-distance relationship
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German astronomer who formulated the three laws of planetary motion
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Johannes Kepler
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Kepler's three laws of planetary motion
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1. elliptical orbits
2. law of areas 3. period-distance relationship |
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the sun is one focus of the ellipse
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Kepler's first law of planetary motion: elliptical orbits
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the crystal, or transparent, spheres proposed in the geocentric view of the universe
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deferents
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Polish astronomer who played the major role in developing the heliocentric view of the universe
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Nicolaus Copernicus
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view of the universe which states that the sun is the center and all heavenly bodies revolve around it
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heliocentric view
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the seven celestial bodies (excluding the stars) observed by the earliest astronomers
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sun, moon, Mercury, Venus, Mars, Jupiter, Saturn
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ancient view of the universe which states that the earth is the center and all heavenly bodies revolve around it
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geocentric, or Ptolemaic, view
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the turning of Earth on its axis
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rotation
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Kepler's major contribution to Copernican theory
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elliptical orbits
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term describing the sun and all other celestial bodies revolving around it
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solar system
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tendency of bodies in motion to remain in motion in the same direction at a constant speed
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inertia
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imaginary line about which the earth is spinning
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axis
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date of the vernal equinox
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March 21 (may vary a day because of leap year)
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type of wind patterns that are evidence of Earth's rotation
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diagonal
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date of autumnal equinox
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September 22 (may vary a day because of leap year)
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