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In an other mail I wrote:
"The angle between a vertical line and the trajectory line of the
setting sun corresponds quite well to the latitude of the observer. At
the equator the sun sets along the vertical line and at the poles the
sun turns along an almost horizontal line. At a given latitude the
time difference between lower and the upper limbs touch the horizon is
fairly constant."

In order to see how constant this is, one could verify it with a
program which can calculate the sun's positions for different
locations and days within a year.

I'm wondering whether this couldn't be used in navigation WITH a
sextant to determine the latitude. How much would the error be if one
would try to determine the latitude by measuring e.g. the time
interval between the sun's upper limb touching 3 and 1 degrees above
the apparent horizon?

Marcel
( Probably the only member in this list having not yet hold a sextant
in his hands.)

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