Chapter 25

Front

Earth's rotation

Back

The spin on its axis causing celestial objects to rise and set.

Front

Earth's revolution

Back

The movement around the Sun (orbit) causing some constellations to only be visible part of the year.

Front

The change of seasons

Back

The direct rays of the Sun strike different latitudes due to the tilt of the Earth and its revolution.

Front

Summer solstice

Back

The day with the greatest duration of daylight in the northern hemisphere. Occurs when the Sun is overhead the Tropic of Cancer (23.5^oN)

Front

Winter solstice

Back

The day with the smallest duration of daylight in the northern hemisphere. Occurs when the Sun is overhead the Tropic of Capricorn (23.5^oS)

Front

Vernal/Autumnal Equinox

Back

Equal length of daylight/night everywhere due to the Sun being directly overhead the Equator.