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prepared by Rabbi Eliezer Chrysler
Kollel Iyun Hadaf, Jerusalem

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Eruvin 56

ERUVIN 56 - was generously dedicated by an anonymous donor in Los Angeles.


(a) In which directions does one square a round town in order to measure the two thousand Amos?

(b) What is the significance of Taurus in the north and Scorpio in the south?

(c) According to Rebbi Yossi, one can gauge the directions by the sun's cycle. What does he mean by ...

  1. ... 'Mehalchasan'?
  2. ... 'Mesavevasan'?
(d) According to Rebbi Yossi, how does one gauge ...
  1. ... the north side of the town?
  2. ... the south side?
  3. ... the east and west sides?
(a) What is the exact duration of a full solar year?

(b) When were the luminaries placed in the sky during the six days of the creation?

(c) If we divide a solar year into weeks, we will be left with exactly one and a quarter days. When did Tekufas Nisan fall ...

  1. ... the year following the creation?
  2. ... the year after that?
(a) If Tekufas Nisan can fall either at the beginning of day (sunrise) or night (sunset), or at midday or at midnight, at which four possible times of day will Tekufas Tamuz fall?

(b) And if Tekufas Tishri always falls at three or nine hours after daybreak or nightfall, then at which four possible times will Tekufas Teves fall?

(a) What does the Gemara mean when it says 'Ein Tekufah Mosheches me'Chaverta Ela Chatzi Sha'ah'?

(b) What happens when the Tekufah of ...

  1. ... *Nisan* falls in the Mazal of Tzedek?
  2. ... *Teves* falls in the Mazal of Tzedek?
(c) At which point must Tzedek be dominant for that to be the case?
Answers to questions



(a) What does the Beraisa mean when it says that after one has squared the town, one squares it again to form a large square?

(b) How much will one gain by each corner ...

  1. ... of the town?
  2. ... of the Techum?
(c) What size town are we dealing with?
(a) The Levi'im were obligated to leave two thousand Amos space outside their cities.
How much of that was 'Migrash'? What is the definition of Migrash?

(b) What purpose did the outer thousand Amos serve?

(c) Bar Ada Meshucha'a explained to Rava the Beraisa which says that the Migrash of the town constituted twenty-five per cent.
What does Meshucha'a mean?

(d) The Gemara asks on Bar Ada's initial explanation 'But that's more than a third'?
What does the Gemara mean?

(a) How does the Gemara raise the fraction from *more* than a third Migrash to *exactly* a third?

(b) How do we ultimately arrive at the stated quarter?

(c) Abaye establishes the case by a town of one thousand Amos square.
Are we speaking about a round town or a square one? What is the basic difference between Abaye's explanation and that of Rava - What does Abaye gain by learning the way he does?

Answers to questions
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