In the misnah it says בערבין in plural. Why plural? Ths Tosfas Chadoshim on misnah explains according to the Rabbenu Taam, there are two nights, two shkiyos. Ths GRA in Shnos Eliyohu, who does not follow the Rabbenu Taam but the geonim, says that the two nights start by the afternoon when the sun turns west and the shkia.
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