click below
click below
Normal Size Small Size show me how
Earth, Moon, Sun
Astronomy Chapter 1 terms
Question | Answer |
---|---|
astronomy | The study of the moon, stars and other objects in space. |
axis | An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates. |
rotation | The spinning motion of a planet about its axis. |
revolution | The movement of a planet about its axis. |
orbit | The path of an object as it revolves around another object in space. |
latitude | A measurement of distance from the equator, expressed in degrees north or south. |
solstice | The two days of the year on which the noon sun is directly overhead at either 23.5 degrees South or 23.5 degrees North. |
equinox | The two days of the year on which neither hemisphere is tilted toward or away from the sun. |
vernal equinox | 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. |
phase | One of the different shapes of the moon as seen from Earth. |
eclipse | The partial or total blocking of one object by another. |
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. |
umbra | The darkest part of a shadow. |
penumbra | The part of the shadow surrounding the darkest part. |
tide | The rise and fall of the level of water in the ocean. |
gravity | The attractive force between two objects; its magnitude depends on their masses and the distance between them. |
spring tide | A tide with the greatest difference between low and high tides. |
neap tide | A tide with the least difference between low and high tides. |
satellite | Any object that revolves around another object in space. |
geosynchronous orbit | The orbit of a satellite that revolves around Earth at the same rate that Earth rotates. |
telescope | A device built to study distant objects by making them appear closer. |
crater | A round pit on moon's surface. |
maria | Dark, float regions on the moon's surface. |