May seem like a simple question considering erev means evening...
But does fasting erev Rosh Hashanah which is similar to Erev Yom Kippur katan (aka Erev Rosh Chodesh) officially begin at nightfall and extends till minchah ketana?
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The Ramma in Orach Chayim siman 581 says it start at amud hashachar and we are not mashlim. The Aruch Hashulchan there and the Mishna Berurah in siman 562 s.k. 10 says that means you don't need to wait till nightfall. But he then brings a Machatzis Hashekel from our siman that says due to the weakening of the generations many people only fast untill mincha gedolah, praying mincha before breaking the fast. The piskei tshuvos brings opinions that are even more meikel like a Yaavetz that says you don't have to actually pray mincha first but can eat right away after chatzos.