- Use a map and measure the distance between the latitudes of
your school and the other school. If, for instance, one of them is situated
at 67
degrees north, and the other one at 60 degrees north, you must measure
the distance between these latitudes in purely north-south direction.
You must therefore pretend that the schools are at the same degree of
longitude.
We should have measured this distance by hiking or driving, but that would take too much time! - Calculate the difference in altitude of the Sun:
Difference = altitude of Sun at southern school - altitude of Sun at northern school - Finally: The circumference of the Earth!
Let us denote the distance between the latitudes of the schools measured in kilometers Y. Let us denote the difference in solar altitude X.Circumference of Earth = Y * (360/X) kilometers Diameter = Circumference/Pi or approximately circumference/3
Created Dec. 31,03, last updated Dec. 31, 03 by Knut Jørgen Røed Ødegaard Adress: webmaster@astro.uio.no |