Solstice - Time when the Sun is farthest from the equator., Equinox - Two times of the year when days and nights are of equal length, Axis - An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates, Revolution - The movement of an object around another object, Rotation - The spinning of Earth on its axis, Seasons - each of the four divisions of the year (spring, summer, autumn, and winter) marked by particular weather patterns and daylight hours, resulting from the earth's changing position with regard to the sun, Gibbous - Moon phase in which more than half of the Moon appears to be illuminated. 75% lit, Crescent - Moon phase that is less than half full 25% lit, Spring Tide - When the tidal range is greatest. (full moon and new moon), Neap Tide - a tide just after the first or third quarters of the moon when there is the least difference between high and low water., HR Diagram - classifies stars by temperature and absolute brightness, Main Sequence - a diagonal area on an H-R diagram that includes more than 90 percent of all stars, Stellar Nebula - A cloud of gas and dust where stars are born,

Astronomy Unit Vocabulary

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