| Definition | Vocab Word |
|---|
| centered view of the universe, earth is sphere that remained motionless at cetner of universe | |
| an imaginary hollow sphere upon which the ancients believed the stars were hung and carried around earth | |
| sun centered universe | |
| earth centered view of the universe | |
| the apparent westward motion of the planets with respect to the stars | |
| average distance from earth to the sun | |
| the gravitational disturbance of the orbit of one celestial body by another constellation | |
| divides the celestial sphere into coordinates that are similar to the latitude and longitude system | |
| angular distance north or south of the celestial equator | |
| angular distance measured eastward along the celestial equator from the position of the vernal equinox | |
| turning or spinning a body on its axis | |
| motion of a body, along a path around some point in space | |
| | Definition | Vocab Word |
|---|
| gradual change in the orientation of Earth's axis over a period of 26,000 years | |
| time interval from one noon to the next, which averages 24 hours | |
| time it takes for eath to make one complete rotation (360 degrees) with respect to a star other than our sun | |
| point in the orbit of a planet where it is closet to the sun, 147 million kilometers | |
| when earth is 152 million kilometers distant, occurs about July 4 | |
| the apparent annual path of the sund against the backdrop of the celestial sphere | |
| the imaginary plane that connects points along the ecliptic | |
| time span of the moon that requires 29 1/2 days | |
| true period of moon's revolution around earth that takes 27 1/3 days | |
| the progression of changes in the moon's appearance during the month | |
| an eclipse of the sun | |
| an eclipse of the moon | |
|
Periodic Table
Planets from the Sun
Digits of Pi
