is credited with the first successful attempt to establish the size of the Earth
Eratosthenes
100
The motion of a body, such as a planet or moon, along a path around some point in space
Revolution
100
What is where rays hit the most intense warm all year round? hint: tropic of cancer
Tropical Zone
100
Planets revolve around the Sun at varying speed
Kepler’s Law of Equal Areas
100
Seasons
What is Result of revolution
200
Developed a star catalog of almost 850 stars, which he divided into six groups according to their brightness
Hipparchus
200
What is Cycle of the phases
Synodic month
200
Hot summers cold winters
Temperate Zone
200
There is a proportional relation between a planet’s orbital period and its distance to the Sun (measured in astronomical units (AU)—one AU averages about 150 million kilometers, or 93 million miles)
Harmonic Law
200
What is June 21–22
Summer solstice
300
was the first Greek to profess a Sun-centered, or heliocentric, universe
Aristarchus
300
What is True period of the Moon’s revolution around Earth
Takes 27 1/3 days
Sidereal month
300
Cold all year round
Polar Zone
300
Every body in the universe attracts every other body with a force that is directly proportional to their masses and inversely proportional to the square of the distance between their centers of mass
Law of universal gravitation
300
What is December 21–22
Winter solstice
400
Declared earth as a planet!
Nicolaus Copernicus
400
Simply shadow effects that were first understood by the early Greeks
Eclipses
400
What is elevation
Height Above Sea Level
400
Orbits of the planets that are oval shaped
Elliptical Orbits
400
What is September 22–23
Autumnal equinox
500
Did not believe in the Copernican system because he was unable to observe stellar parallax
Tycho Brahe
500
Moon moves in a line directly between Earth and the Sun