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inclination of earth's axis
Earth is tilted at about 23.5° from perpendicular to the plane of ecliptic
the revolution of the earth
365 days
the rotation of the earth
Earth rotates west to east at ~1000 mph
Spring Equinox
March 21 0 degrees
Summer Solstice
June 21 tropic of cancer 23.5 N degrees
Fall Equinox
september 23 0 degrees
Winter Solstice
December 21 tropic of capricorn 23.5 S degrees
standard time
In 1884, the Greenwich/Prime Meridian was chosen as the reference for standard time
how many time zones are there?
24
structure of the solar system
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
