How to use the sun to tell time when you’re in survival mode.
WHOA FALSE! This drastically changes with latitude AND the time of year.
So first, if you are in the Northern Hemisphere, estimate your latitude using Polaris, the North Star.
Next, if it is either the vernal or autumnal equinox, then you know, at noon, the sun will be precisely “90 degrees minus your latitude” degrees above the horizon. Then, using your fingers and fist (2.5 and 10 degrees respectively) you can estimate the sun’s position in the sky relative to noon, and since it is equinox, you know that there are precisely 12 hours of daylight and 12 hours of night.
Now, it seems very unlikely that you would require this sort of “survival” information on equinox, so what would you do then?
Well, since you know that on the solstice, the sun will either be 24 degrees higher or lower (depending on if it is winter or summer) than it was at equinox, you can estimate how high it should be at noon given your relative position in the year between equinox and solstice.
Or you could construct a sun dial and do some simple trigonometry…
So yeah, just wear a watch.