[Avodah] zman hadloko erev shabbos and motzei shabbos

[Marty Bluke]

R' Akiva Blum wrote:
<

I don't understand this cheshbon.
Accoring to RT, visable shkiah is irrelavant. It should follow that
calculating the length of a 'hour' would include the 72 minutes after
shkiah and 72 before haneitz. Total minutes in a day is 864 (instead
of 720 acc. To Gra).
One hour is 864/12=72 minutes. One and a quater hours is 72*1.25=90
minutes. So plag is 90 minutes before 72 after shkiah which is... 18
minutes (zmanios, in the winter)  before shkiah.

<Where did I go wrong?

The Rishonim (Ramban, Rashba) say explicitly that plag hamincha is 1/6
of a mil before shkia which is approximately 3 minutes before shkia.
Based on this and other calculations R' Willig (he printed this in his
sefer on berachos and Shabbos) claims that according to these Rishonim
a mil is 22.5 minutes and therefore tzeis is 90 minutes after shkia.
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