What Is Ic Butal How Are The MC And IC Calculated And How Much Do They Deviate From 90 Degrees To AC And DC?

How are the MC and IC calculated and how much do they deviate from 90 degrees to AC and DC? - what is ic butal

Why is this so?

For example, say that the Scorpio Ascendant, what the real MC and the IC?

and that both represent symbolically?

Please explain.

Thank you for your answers!