Astronomy & Seasons

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Tide

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rise and fall of ocean water.

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Spring tide

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a tide with the greatest difference between low and high tides (high highs and low lows).

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Neap tide

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a tide with the least difference between low and high tides.

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Gravity

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force of attraction between any two objects.

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Orbit

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The path of an object as it revolves around another object in space.

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Axis

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An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates.

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Revolution

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Earth’s movement around the sun that takes 365 days.

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Rotation

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Earth spins every 24 hours (1 day).

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Solstice

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the day when the sun is at its greatest distance north or south of the equator.

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Equinox

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Each of the two times of the year when days and nights are of equal length (autumn and spring).