I see my message bounced yesterday for some unknown reason and that Iris already answered, however I've got a little more input.... _______________________________
The daylength at the equator *regardless* of your height (altitude) is precisely 12 hours every single day of the year. Now this holds only directly on the equator. This is because the light always hits the earth exactly perpindicularly (90 degrees) at the equator. As you start going north or south of the equator the divergence from 12 hours gets more and more pronounced as you get further and further away. Furthermore at the equator the sun rises and sets always in due west and east. For the rest of the world all these conditions are fufilled only at the fall and spring equinox. Final consequence of this all is there is no "red" shift of the light as fall approaches. Sunlight remains at the same temperature all year round. -Dave (Graduate student in optics/biophysics)
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