We seem to have just entered nights of perpetual twilight (the dark blue band), so fconn was right - it's not as dark as it was.
Addition from JudgJim: The program for creating this graph is freely available here: Download Sungraph
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2 comments:
Interesting. the different shades are daylight, civil twilight (sun 6deg below horizon), and nautical twilight(12deg below). Using the sungraph program, i see that from May31 to July14, our sun never drops below 12deg, hence it's never really dark!
Thats a load of rot! The whole thing is gone pear shaped
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