“At the equator, it would be 90* (IOW - 0*, directly over head at noon)...”
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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”.
OK. I'll do my own navigating, thank you.