Daylight graph
(Click on any graph to see a larger image.)
Near North Pole (79°N). They see no Sun for half the year, and then it's day non-stop. Note the curve of spread.
Anchorage, Alaska. Spikes in these graphs are due to daylight saving time turning on and off.
San Francisco, California.
Singapore. It's just 1° off the equator, and it shows.
Wellington, New Zealand. The graph is concave in Southern Hemisphere, where the seasons are reversed.
Antarctica, 79°S. Note how this is a complement of what we saw for the Arctic.
Script
These graphs were created from data in sunrisesunset.com. I wrote a script to parse off the values from those webpages and plot the graph using GD library. You can download the script. (Made available with permission from owner of that website.)
This file created: 15/Dec/2006
