May eruv techumin be made b'ein hashmashot (twilight), and if done, is it valid?
Synopsis
L'chatchila eruv techumin may not be made during twilight (bein hashmashot). If made during twilight, there is a dispute over whether it is valid b'dieved.
More in Yom Tov Adjacent to Shabbat — Eruv Tavshilin
Is eruv techumin (eruv of boundaries) permitted l'chatchila only for a matter of mitzva, or also for optional (reshut) purposes?
4 opinions
What qualifies as a 'matter of mitzva' sufficient to permit making eruv techumin?
4 opinions
Is eruv techumin permitted when made out of fear (e.g., fleeing non-Jews or bandits), and does the valid eruv also permit travel for optional purposes?
2 opinions
When two people commission an agent to make eruv techumin for each of them — one eruv placed before Shabbat and one placed during bein hashmashot, with the first eruv eaten during bein hashmashot and the second eaten after nightfall — do both acquire a valid eruv?
4 opinions across 3 eras
What blessing is recited when placing eruv techumin, and is the verbal declaration ('through this eruv...') indispensable?
4 opinions
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If the validity of an eruv is in doubt (e.g., it is uncertain whether it existed at bein hashmashot), is it valid?
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If the eruv was locked in a cabinet/tower (migdal) and the key was lost before bein hashmashot, requiring Torah-level labor to retrieve it, is the eruv valid?
Shabbat Travelers and Eruv Boundary
Is an eruv techumin placed in a cemetery valid?
Carrying on Yom Tov
When acquiring eruv techumin by foot (bein hashmashot) on the second day of a Shabbat-Yom Tov combination, may one verbally declare the eruv?
Eruv Tavshilin Procedure
Discussion
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