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Best position for a vegetable patch
If it's really just the angle, then I should be able to get tropical levels of sunlight by rigging up a suitably angled mirror to reflect the light. eg. at the poles, a mirror of 1m*1.41m at 45 degrees would catch 1 sq m of light and reflect it to the ground as if it had come from directly above. Maybe this could be designed into greenhouse roofs so that they had one side of the roof angled with mirrors instead of glass to give the effect of direct sunlight from above? No, because a shallower angle means the light has a longer route through the atmosphere, so less of it arrives at the earth's surface. It's not the angle of incidence in itself that matters, it's the effect that that angle has in determining how much light gets here. -- Kay Easton Edward's earthworm page: http://www.scarboro.demon.co.uk/edward/index.htm |
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