OK. Leaving declination and other complications out of the discussion:
I am at, approximately 57* North Latitude. The highest possible angle of the sun above the horizon on the Summer solstice is 57*.
At the equator, it would be 90* (IOW - 0*, directly over head at noon).
At the poles it would be right on the horizon. (Again, ignoring declination)
Navigation 101.
“At the equator, it would be 90* (IOW - 0*, directly over head at noon)...”
*********************************************************
NO!!! WRONG!!!
On (approx.) Mar 21 and Sept 21, The Sun will be directly over the Equator.
At the Summer Solstice at the equator (June 21), the Sun (at TRUE Noon, as opposed to “Standard” or “Daylight” time, will be Approximately 23.5 degrees above (north of) the perpendicular (dependent on the “height of eye” of the observer) to the “horizon”.
There’s an app called “dminder” that will tell you when you are getting D production at your latitude. It has another feature to track your exposure. For instance at this moment I can get another hour of D. I have another that’s totally bitchin. It’s called “Sun Seeker”. Where ever you point the phone it will tell you where the sun will be at that time any day of the year. It’s handy for gardening.