Dr. Hoch

2/25/2019

Dr. Hoch

RGPL 103 Global Cities: Planning and Development

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Earth's Orbit Around Sun

Aphelion July 6 (12:00)

152.5 Million Km

EARTH

Perihelion Jan 3 (00:00)

147.5 Mil. Km

SUN

Dates for 2010

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Earth Rotation

Earth's axis N Pole

23 1/2?

Ecliptic Plane (Plane of earth revolution around sun)

Northern Hemisphere Seasons

? Summer

? North pole tilted toward Sun ? Days are longer than the nights ? Get more energy - higher temperatures

? Fall

? Neither pole tilted toward the Sun ? Days about equal with nights ? Less energy than in the summer ? Cooler temperatures

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Northern Hemisphere Seasons

cont.

? Winter

? North pole tilted away from the Sun ? Days shorter than the nights ? Get less energy-Cold temperatures

? Spring

? Neither pole tilted toward the Sun ? Days about equal to nights ? More energy than winter- Warmer temperatures

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Global regions

? Tropics (23 ??N - 23 ??S) ? Low latitudes (30?N - 30?S) ? Mid latitudes (30?N - 60?N and 30?S - 60?S ) ? High latitudes (60?N - 90?N and 60?S - 90?S )

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Key positional relationships

?Tropic of Cancer - 23 1/2? N

?Highest latitude in the Northern Hemisphere that the suns vertical rays ever reach

?Tropic of Capricorn- 23 1/2? S

?Highest latitude in the Southern Hemisphere that the suns vertical rays ever reach

?Arctic circle- 66 1/2? N

?24 hrs of daylight-summer solstice ?24 hrs of darkness at winter solstice

?Antarctic circle- 66 1/2? S

?24 hrs of daylight-winter solstice ?24 hrs of darkness at summer solstice

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