[Avodah] Tisha B'Av on Sunday

[Doron Beckerman]

RSF writes:

>> I have a question about when 9 Av falls out on Sunday, as it did this
year.

 The halacha is that the fast starts at shkiah. Why is it that we're allowed
to fast on Shabbos for 9 Av, especially when Shabbos is docheh 9 Av? Since
Bein Hashmashot is a safeik, why don't we see safeik d'oraita l'chumrah in
the case of oneg Shabbos, and safeik d'rabbanan l'hakeil in the case of
Tisha B'av? <<

1) Oneg Shabbos is not D'Oraysa, but MiDivrei Neviim.
2) Missing a few minutes of ability to eat is not a Bittul Oneg Shabbos and
it isn't fasting - you've eaten all day.
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