Hawaii Sunset

Here’s an example – On tisha b’av there’s a minhag to say 3 parshiyos of shema after mincha while wearing tefilin, since during shachris while shema is recited, it was done w/o tefilin. The mishna berura says NOT to say shema since the mitzva of krias shema was already fulfilled, saying it now would be in the category of limud hatorah. A rov who is the son of a godol beyisroel was consulted. The response was to follow the minhag of saying shema.