The solar altitude angle = 90-(the latitude difference between the local latitude and the direct point of the sun)

The vernal equinox is directly at the equator 90-(30-0)=60.

The direct summer solstice at 90-(30-23.26) N = 83.26 degrees 23 minutes.

The autumnal equinox is directly at the equator 90-(30-0)=60.

At 23 degrees and 26 minutes south latitude, the direct solstice in winter is 90-(30+23.26)=36.34.