Problem: To determine the maximum altitude of the Sun in the sky at a particular location on a particular day of the year, you must have two pieces of information:
I. the latitude of the location
II. the latitude at which the Sun is directly overhead on that particular day
If we call the difference (in degrees) between these two latitudes D, then the maximum altitude of the Sun (in degrees) at the latitude of interest is 90 - D.
For example, if you are in Washington, DC (latitude approximately 39°N) and the Sun that day is overhead at latitude 10°N, then D=29°. The maximum altitude of the Sun in Washington, DC that day would be 90° - 29° = 61°.
Determine the maximum altitude of the Sun at your latitude on the equinoxes and the solstices.