unit 1 understanding the universe

when a planet is closest to the Sun (e.g. the Earth in January)

Perihelion

1 of 7

when a planets is furthest from the Sun (e.g. the Earth in December)

Aphelion

2 of 7

– the greatest angular separation of an inferior planet from the Sun (e.g. Venus is 45 degrees)

Greatest elongation

3 of 7

The Earth takes 23 hours and 56 minutes to rotate. 4 minutes less than 24 hours.

sidereal day.

4 of 7

The line at which the sky meets the land

Horizon

5 of 7

Longitude line which runs through Greenwich, London = 0' east/west

PRIME MERIDIAN

6 of 7

Greek geographer and mathematician in 3BC who first accurately measured the earth's circumference.

Eratosthenes

7 of 7

Other cards in this set

when a planets is furthest from the Sun (e.g. the Earth in December)

Aphelion

– the greatest angular separation of an inferior planet from the Sun (e.g. Venus is 45 degrees)

The Earth takes 23 hours and 56 minutes to rotate. 4 minutes less than 24 hours.

The line at which the sky meets the land

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