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12 Cards in this Set

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Direct Sunlight

sunlight that strikes Earth’s surface at close to a 90° angle.

Earth’s axis

an imaginary line through the center of Earth that connects the North Poleto the South Pole. o Earth rotates about its axis once every 24 hours. o Earth’s axis is tilted at an angle of 23.5 degrees.

Equator

– an imaginary horizontal line around the middle of Earth.

Northern hemisphere

the half of Earth north of the equator.

North Pole

the northernmost point on Earth.

Indirect sunlight

sunlight that strikes Earth’s surface at an acute angle (less than 90

Season

one of the major divisions of the year, usually based on regular weatherchanges. o In most places, the year is divided into four seasons: winter, spring, summer, and o In tropical regions, average temperatures do not change much during the year. In autumn (fall). Each season is three months long. these regions, it is common to refer to the “rainy season” and the “dry season.”

Solstice

one of two days during the year on which the direct rays of the Sun reach thefarthest from the equator.

Southern hemisphere

the half of Earth south of the equator.

South Pole

the southernmost point on Earth.

Summer solstice

the first day of summer.o The summer solstice is the longest day of the year. North and south of the o In the northern hemisphere the summer solstice occurs on or near June 21. o In the southern hemisphere the summer solstice occurs on or near December 21.tropics, it is also the day when the noon Sun is highest in the sky.

Winter solstice

the first day of winter.o The winter solstice is the shortest day of the year. It is also the day when the o In the northern hemisphere the winter solstice occurs on or near December 21. o In the southern hemisphere the winter solstice occurs on or near June 21.noon Sun is lowest in the sky.