Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/26

Click to flip

26 Cards in this Set

  • Front
  • Back
Two reasons why ancient people built astronomical structures.
1) RELIGIOUS RITUAL
2) AGRICULTURAL DATES
The theory that everything revolves around the Earth.
GEOCENTRIC
Scientist who constructed the Heliocentric Model.
COPERNICUS
Motion in the "forward" direction.
PROGRADE
The theory that everything revolves around the Sun.
HELIOCENTRIC
Smaller orbit in the geocentric model.
EPICYCLE
Primary individual who devised the Geocentric Model.
PTOLEMY
5 celestial objects, other than stars, visible with the naked eye.
SUN, MOON, MERCURY, VENUS, MARS, JUPITER
Larger orbit in the geocentric model.
DEFERENT
"Backward" motion.
RETROGRADE
Real reason for retrograde motion.
CHANGE IN ANGLES DUE TO DIFFERENT ORBIT SIZES AND THEREFORE DIFFERENT APPARENT ORBITAL SPEEDS.
Rationale for the geocentric model.
1) Can't feel Earth moving.
2) Apparent brightness of planets changes with distance from Earth.
3) Retrograde motions explained by dual orbits.
Planets closer than Earth to the Sun
INFERIOR
Three "proofs" of the Copernican Model
1) ABERRATION OF STARLIGHT
2) STELLAR PARALLAX
3) SPACE PROBES
Rationale for the Heliocentric Model
1) Only Moon orbits Earth.
2) Angles account for retrograde motion.
3) Stars are much further away.
4) Earth spins on its axis.
Evidence for Heliocentric Model provided by Galileo
1) Jupiter has moons.
2) Venus has phases as seen from Earth.
Another name for the Heliocentric Model
Copernican model
Planets further from the Sun than Earth.
SUPERIOR
alignment of Stonehenge
SUN ON SOLSTICES
alignment of Newgrange Burial Mound
SUN ON WINTER SOLSTICE
alignment of Sphinx
LEO?
alignment of Pyramids
ORION, CARDINAL DIRECTIONS, OSIRIS (ORION)/ISIS
alignment of Cahokia Mounds
CARDINAL DIRECTIONS, SUN
alignment of Angkor Wat
DRACO?, PRECESSION
alignment of Caracol
SUN, VENUS
alignment of Medicine Wheels
STARS, SUN ON SOLSTICE