old man – In regards to calling those who say that in the Middle East Tzais is 72 after the visible shkiyah “ridiculous” and “logically untenable”, please don’t forget that the Mechaber clearly states that Tzais is 72 minutes after the sun is not visible (OC 261:2).
Since he lived in Eretz Yisroel, I hesitate to call his opinion “ridiculous” or “logically untenable”.