Visibility of sun in different altitudes

1. Jun 30, 2011

trina1990

I've to show , " at the spring equinox for a place of latitude ø, the sun will become visible at the top of a tower of height " H " feet, about
" 13.94(root over )H * sec ø "

But as far i made calculations, i got the amount of
"4.24 root over H * sec ø "

I used all the measurements in feet but i could not derive this amount of 13.94 instead of 4.25. .
Plz someone held me to obtain it. .

I used this formula
" root over (2RH)/(2piR *cosø) =time to be obtained/86400 "
Now plz identify my err

2. Jul 1, 2011

Andrew Mason

Please explain the problem and the calculations you have made. I don't understand why the sun would not be visible at the base of the tower.

AM