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I was in warmer climes recently and noticed "again" that traveling
north/south, there's a big change in the amount of daylight at this time of
year. And for some reason I thought, this should be a way that one can
determine their latitude, no?

If one times the length of the day at any given location (using whichever
version of "sunrise" and sunset you prefer), and one knows the date relative
to the equinox or solstice day, one should be able to calculate the latitude
one is at, no? It seemed interesting, that with just a watch and calendar
one should be able to get latitude this way. Since most modern watches run
to better than a second a day, this would seem to be a reasonable navigation
tool.

Has anyone seen a formula for this, or does anyone want to give it a try?

   

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