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Astronomy
1.1 & 1.2
Term | Definition |
---|---|
Moon Phases | The different appearances of the illuminated portion of the moon as seen by an observer, usually on Earth. |
Eclipses | Caused by one object passing into the shadow of another object. |
Solar Eclipse | The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth. |
Lunar Eclipse | The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon. |
Tides | The periodic rise and fall of sea level caused by the gravitational pull of the Moon on the Earth. |
Gravity | The force of attraction between any two objects in the universe. |
Astronomy | study of outer space and objects in it |
Revolution | the time it takes an object to travel around its sun. |
Orbit | The path an object takes as it revolves around another object. Earth's orbit as it travels around the sun is an ellipse. |
Rotation | the spinning motion of Earth or any object in space, like a top on its axis.(Earth orbit = 24 hours) |
Seasons/days | These changes are caused by the change in the angle of the sunlight hitting the Earth as it travels around the sun. |
Axis | The imaginary line around which the earth rotates, extending through the poles. |
Spherical | shaped like a ball or a globe |
Solstice | The two days of the year on which the noon sun is directly overhead at either 23.5 degrees S or 23.5 degrees N. |
Equinox | The two days of the year on which neither hemisphere is tilted toward or away from the sun. |
Vernal Eclipse | The day of the year that marks the beginning of spring in the Northern Hemisphere. |
Autumnal Equinox | The day of the year that marks the beginning of fall in the Northern Hemisphere. |