with the greatest respect to all posters, the shulchan aruch and the remo discuss when mincha is prayed, whether we can wait till “tsais” or not-when it becomes night. the time of mincha has nothing to do with rabbeinu tam or geonim times.they are concerned about how much after sunset does night fall. there is a ‘second’ shkiah concept but it is not mentioned in shulchan aruch and rabbeinu tam’s zman does not appear in this siman.
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