| A | B |
|---|
| new and full | phases of the moon when there is the greatest difference between high and low tides |
| 23.5 degrees | angle at which the earth is tilted |
| 23.5 degrees North | latitude line for direct sun rays during the summer solstice in the Norther Hemisphere |
| 24 hours | length of Earth's rotation |
| waning crescent | moon phase where a small sliver is visible on the left side |
| solstice | time of year when the sun shines directly on 23.5 degrees north or south |
| equinox | times of the year when neither end of the earth is tilted away from the sun |
| vernal | equinox which marks the beginning of spring in the Northern Hemisphere |
| waxing gibbous | phase of the moon when 3/4 is visible on the right side |
| eclipse | when moon's shadow hits the earth or earth's shadow hits the moon |
| June 21 | date in the Northern hemisphere with the longest daylight hours |
| full moon | moon phase in which a lunar eclipse can occur |
| December 22 | date Anarctica has 24 hours of daylight |
| 365 1/4 days | Length of the Earth's revolution around the sun |
| phase | the shape of the moon that you see from Earth |
| rotation | causes the day and night on Earth |
| equinox | doldrums along the equator occur during these times of the year |
| umbra | darkest part of the moon's shadow on Earth during an eclipse |
| equinox | day and night are equal length during this time of the year |
| waning gibbous | phase of the moon when there is 3/4 visible on the left side |
| equator | direct rays of the sun shine here during an equinox |
| new and full | spring tides occur during these moon phases |
| 1st quarter | phase of the moon when half is visible on the right side |
| penumbra | less dark part of the moon shadow on Earth during an eclipse |
| far side | side of the moon not visible from Earth is called this |
| orbit | path of an object as it revolves around another object |
| autumnal | equinox in the Northern Hemisphere during September |
| increases | amount of sunlight reflecting from the moon does this when changing from New to Full |
| between sun and moon | where earth is located during a lunar eclipse |
| sunlight | reflects off the moon for it to be visible from Earth |
| sunlight | moon phases depend on this to be lighted |
| new moon | phase of the moon when a solar eclipse can occur |
| full moon | phase of the moon when a circle is visible |
| Sputnik I | first artificial satellite launched into space |
| axis | rotating means to spin on this |
| 24 hours | length of the Earth's spinning on it's axis |
| December 22 | date of the longest daylight hours in the Southern Hemisphere |
| waxing crescent | moon phase with a small sliver visible on the right side |
| 3rd quarter | phase of the moon when half is visible from the left side |
| 25 hours | how long it takes for two high and tow low tides to occur |
| solar eclipse | eclipse which can occur when the moon moves directly between sun and Earth |
| 23.5 degrees South | direct rays of the sun hit this latitude line during the summer solstice in the Southern Hemisphere |
| 1st and 3rd quarter | neap tides occur during these moon phases |
| June 21 | date in the Northern Hemisphere for summer solstice |
| axis | imaginary line which passes through the Earth |
| solar | eclipse where the moon is in between the sun and Earth |
| between sun and Earth | moon location during a solar eclipse |
| new moon | phase of the moon where the moon is not visible from Earth |
| new moon | phase of the moon when the lighted side faces away from Earth |
| geosynchronous orbit | orbit is equal to the orbit of the Earth |
| June 21 | date the arctic circle has 24 hours of daylight |
| gravity | force which pulls the moon and Earth toward each other |
| astronomy | study of the moon, earth, and stars |
| satellite | natural or artificial object which revoles around an object in space |
| axis | tilt of this causes the seasons on Earth |
