On the equinoxes of the year and at solar noon, the sun will be at the same elevation angle subtracted from 90 degrees in the sky as the latitude where you are located.

For example, if you are on the 30th parallel, the sun will be at a 60 degree elevation (90 - 30) on the first day of spring and fall.

This is the mean angle of the sun over a year.

When mounting solar panels at a fixed angle, you want the face of the panels pointing at this elevation angle to maximize power throughout the year.

Most modern solar panels have a columnating grating coat to reduce the need to adjust the panel angle.

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