| A | B |
|---|
| rotation | earth's spinning on it's axis |
| axis | imaginary line thru Earth's center from N to S |
| revolution | movement of one object around another object |
| orbit | Earth's path around the sun |
| astronomy | study of the moon, stars, & objects in space |
| latitude | measure of distance from equator in degrees north or south |
| solstice | 2 days the noon sun is 23.5 degrees noth or south |
| equinox | equal night and day hours |
| vernal equinox | 3/21, spring in N. hemisphere |
| autumnal equinox | 9/23, fall in n. Hemisphere |
| moon phase | depends on how much sunlit moon faces the earth |
| waning | you see less of the moon |
| waxing | you see more of the moon |
| eclipse | an object in space comes between the sun and a third object casting a shadow |
| solar eclipse | moon is between the earth and sun, moon blocks the sun |
| lunar eclipse | Earth is between the sun and moon, moon looks dark |
| umbra | darkest part of moon's shadow |
| penumbra | largest part of moon's shadow |
| tide | rise and fall of water, usually every 12.5 hr. |
| gravity | force or pull between 2 objects |
| neap tide | high and low tides are least different |
| spring tide | high and low tides are greatest in difference |
