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For this example the display has been changed to show midday across the middle of the timetable rather than midnight.
It covers 24 hours vertically and 1 year horizontally.
Apart from showing times of sunrise and sunset the display can show variation in solar altitude by time of day throughout the year.
For a location like London the Sun doesn't get above 20 degrees in mid-winter and even in mid-summer barely gets over 60 degrees.
The day width was changed from the usual 6 pixels to 1 pixel so that a year fits comfortably on one screen.
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