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Divrei Torah

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Comments on Vayeshev calculation: Figuring out which "Yom Eidam" it was

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Vayeshev calculation: Figuring out which "Yom Eidam" it was

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Note: The following is a pilpulistic calculation I made based on a Rashi from the parsha, only to discover at the end that the question was more or less answered at the end of the midrash Rashi is quoting from...either way, I thought it was a fun exercise at the time.

Rashi on the verse in Beresheet 39:11 says:

"AND IT CAME TO PASS ON A CERTAIN DAY — This means as much as “and it came to pass when a certain distinguished day arrived” — a day of merriment, a day of their sacred feast when they all went to the temple of their idols..."

The question is, could one figure out which ancient Egyptian holiday was this?

According to Rabbi Yehudah Zoldan, the day that Yosef was put in jail was Rosh Hashanah. Per this, we can calculate which day it was on the Egyptian calendar.

https://www.ucl.ac.uk/museums-static/digitalegypt/chronology/calendar.html

According to this chart from the UCL site, in the Julian calendar, September, the non-Jewish month Rosh Hashanah usually comes out on [1], is parallel to the Egyptian month of Thoth, which is the first month of the Egyptian year. In the month of Thoth there were several festivals, and some of them match the description Rashi gives us and what we know about Potiphar:

a. The first day of the month was the Egyptian New Year's Day and the birthday of the Egyptian sun deity, Ra-Horakhty.

b. The fifteenth of the month was the Day of giving offerings to Hapy and Amun to secure a good flood.

c. The twentieth of the month was the Day of Tekh - the day of drunkeness.

Option a. works because the name Potiphar is derived from the name of the god Ra and means Pt-P-Ra or "servant of Ra". Option b. works because Amun was also a sun deity who at one point had been merged with Ra (although likely much later than this story). Option c. works because Rashi describes the festival as "a day of merriment", something that goes well with drunkeness.

So which is it? For this we have the midrash Rashi is quoting from, Tanchuma Vayeshev 9:

"R. Judah maintained: A fete in honor of the Nile was being held on that day, and all the people had journeyed to the river..."

Or in other words, the answer is option b., the day of giving offerings to Hapy and Amun to secure a good flood, on the 15th of Thoth (Hapy being the god of the Nile).


  1. This is from when the Julian calendar was first made, as a parallel to the Egyptian calendar and was still accurate. ↩︎

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General comments (4 comments)
General comments
DonielF‭ wrote almost 4 years ago

Good attempt, but you're forgetting something important: the Egyptian calendar didn't have leap years in the Julian/Gregorian sense, rather having a calendar of exactly 365 days, where each of the twelve months were exactly 30 days divided into 10-day "weeks," and at the end of the calendar was five "extra" days observed as a pagan holiday. You can't just compare the Egyptian calendar directly to the Julian one, as there's a shift of one day every four years.

Harel13‭ wrote almost 4 years ago

@DonielF I suppose you should write UCL and tell them that.

Harel13‭ wrote almost 4 years ago

@DonielF More to the point, you probably know more about calendars than I do. It was my impression that the comparison made by UCA was of a "perfect" Julian calendar, meaning - when it was first started, before shifts and leaps were made. Which is why I also thought that the Julian could still be compared to the Gregorian, even though the Julian was way-off when the Gregorian rolled into town.

DonielF‭ wrote almost 4 years ago

@Harel You can trivially compare calendars to one another; we do it on a regular basis between Gregorian and Jewish. The trick is that when two calendars use nonidentical year lengths, you need to keep track of how the difference adds up over time.