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1. The appearance of three average-size stars in the sky after twilight is a sign that night has arrived.
2. If a person performs Melachah during Bein ha'Shemashos (twilight) on Friday evening and during Bein ha'Shemashos on Motza'i Shabbos, he has definitely desecrated Shabbos.
3. Raban Shimon ben Gamliel did not like the way the Babylonian Jews fulfilled the custom of blowing Shofar before Shabbos.
4. Tana d'Vei Rebbi Yishmael states that six Shofar blasts should be sounded every Erev Shabbos.
5. There is a dispute about whether Shabbos comes in immediately after the Shofar blasts.
A BIT MORE
1. In contrast, large stars that are seen during the day, or small stars that are seen only at night, do not indicate the arrival of night.
2. This is because Bein ha'Shemashos is either day or night. If it has the status of day, then he desecrated Shabbos during Bein ha'Shemashos on Motza'i Shabbos. If it has the status of night, then he desecrated Shabbos during Bein ha'Shemashos on Friday evening. (He would have to bring a Korban Chatas if he desecrated Shabbos by accident on both nights.)
3. The Babylonian Jews' last three Shofar sounds were a Teki'ah (then a pause), a Teki'ah, and a Teru'ah. Raban Shimon felt it was inappropriate to go into Shabbos from the Teru'ah. He maintained that one should instead blow a Teki'ah, Teru'ah, and then a Teki'ah.
4. The first blast tells those in the field to stop working. The second one tells the stores to close. The third tells everyone to finish all Melachos. Three more blasts are then blown: Teki'ah, Teru'ah, Teki'ah, signaling the start of Shabbos.
5. Rebbi Yosi b'Rebbi Chanina: The sages gave time for the caretaker to bring his Shofar to his house after sounding the Shofar. Chachamim: The caretaker would place his Shofar down immediately after sounding the blasts, as Shabbos set in immediately after he sounded the blasts.
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