Quote:
Originally Posted by Autopilot
Based purely on average sunlight hours for cities closest to our latitude
Perth 3211hrs year
Adelaide 2768.6hrs year
Sydney 2480hrs year
The insolation figures would disagree if we looked at total average irradiance for all three cities. I do believe that Perth has more days than any other Australian capital where over 100 000 lumens per meter squared are recorded for longer than 2 hours <--- this is considered to be a bright day.
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I do agree that the brightness or intensity is higher than the others as stated in your figures, but it is only showing 100 000 lumens and over which can be effected by variables such as cloud cover ie. 1/8 vs 7/8 . It does not mean that we are having longer days.
Either way I have 2 kids who go to bed when I tell them, not when the sun does.