Talmud for Rosh Hashanah 46:7
בראשונה לא היו זזין משם כל היום התקין רבן גמליאל הזקן שיהו מהלכין אלפים אמה לכל רוח
TO COME. ORIGINALLY THEY USED NOT TO LEAVE THE PLACE THE WHOLE DAY,<span class="x" onmousemove="('comment',' If they came on Sabbath, as they had already exceeded the limit of two thousand cubits.');"><sup>15</sup></span> BUT RABBAN GAMALIEL THE ELDER INTRODUCED A RULE THAT THEY COULD GO TWO THOUSAND CUBITS FROM IT IN ANY DIRECTION.
Jerusalem Talmud Rosh Hashanah
HALAKHAH: Rebbi Joḥanan said, even the most error-prone person would not err in this matter, before the sun, after the sun75Whether the moon was seen closer to the earth than the sun or farther away.? It only is needed for its concavity; the concavity towards the sun, or the concavity away from the sun74As explained in the Halakhah, this refers to the concavity of the visible moon, which must point away from the sun.? Bar Qappara stated both: Before the sun or behind the sun, the concavity towards the sun or the concavity away from the sun? Rebbi Joḥanan said, it is written76Job 25:2. Babli 23b. Deut. rabba 5(12).: Rule and fear are with Him, Who makes peace in His heights. During the existence of the sun it never saw the defect of the moon.
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