MadSci Network: Astronomy
Query:

Re: In southern hemisphere does sun rise in east and pass north or south

Date: Sun Aug 6 15:11:42 2000
Posted By: Enrico Uva, Secondary School Teacher Chemistry, Physical Science
Area of science: Astronomy
ID: 959623600.As
Message:

The earth rotates from east to west: that's the reason the sun rises in 
the east and sets in the west. So that fact doesn't change if you're 
observing sunrises/sunsets in the southern hemisphere. Whether it arcs 
across the northern or southern part of the sky in the southern hemisphere 
depends on the observer's latitude. From December 21 or 22 to March 20-21, 
the sun passes directly overhead at noon, from latitudes 22.5 South to the 
equator. So, for an observer in the southern tropics, he may see the sun 
span across to the north or south, depending on the time of the year. 
Imagine yourself at a specific spot on a globe and use a light bulb as the 
sun. So for example if you're in Lima, Peru (13 S) for Christmas when the 
sun is at the zenith at noon in Rio (22 S), the sun will rise slightly to 
the south of east, arc across the southern sky and set slightly to the 
south of west. But in the spring when the sun is at the zenith at noon 
above the equator, the sun in Lima will rise slightly to the north of 
east, arc across the NORTHERN sky and set slightly to the north of west.
For latitudes below 22S, then the sun will always arc in the northern part 
of the sky between sunrise and sunset.

Enrico Uva


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