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2
votes
2answers
120 views

Is there lunar drift in the fixed Hebrew calendar?

It is known that there is a slight discrepancy in the average length of a year according to the Hebrew calendar and the average length of an astronomical solar year which causes a seasonal drift in ...
5
votes
2answers
216 views

Illustrated hilchot Kiddush Hachodesh

I remember seeing about 20 years ago a beautiful annotated commentary on Rambam's hilchos kiddush hachodesh, with extensive illustrations and calculations, explained according to both ancient and ...
8
votes
4answers
327 views

How accurate is the Molad?

To the best of my knowledge the Molad is every 29.5 days + 793 Chalakim. Is there any information showing if the current Molad calculation is accurate scientifically? If it is off by how much is it ...
9
votes
4answers
279 views

Why did Hashem create the world in such a way that a leap year is needed?

I understand why we have a leap year; to keep the sun and moon cycles in sync, so that Pessach is always in the spring. That's all technical, as a result of the moon orbiting too slowly - or the sun ...
5
votes
1answer
86 views

Counting years according to the solar calendar

I once heard there is an opinion in Rishonim (maybe Gaonim?) that says we count ones years of life according to the solar calender. So for example a boy would become bar mitzvah when he would turn 13 ...
3
votes
3answers
297 views

Significance of number 613 regarding the mitzvot

According to the Talmud (Makos 23b) "Moshe received 613 Mitzvos. They are 365 Lavim (negative commandments), corresponding to the days of the (solar) year, and 248 Mitzvos Aseh (positive commandments),...
4
votes
2answers
236 views

Shouldn't the flood have ended on the 18th of Cheshvan?

Inspired by this question: New date at sunset: question on Sifse Chachamim The Torah tells us that the Flood started the 17th of Cheshvan (Bereshit 7:11) and concluded the 27th of Cheshvan (Bereshit ...
1
vote
1answer
265 views

What was the first Hebrew date of the first Molad?

If one were to represent the Molad Tohu as a date, comprised of a month, day, year, hours, minutes, seconds, and chalakim, what date would that be?
8
votes
1answer
188 views

New date at sunset: question on Sifse Chachamim

Avoda Zara 25 cites a difference of opinion as to how long the sun stood still for Y'hoshua: twelve hours, twenty-four, or thirty-six. According to those who say twelve or thirty-six, the sun finally ...
7
votes
3answers
742 views

Eclipse of the moon, bad sign for the Jews

Tonight, December 20, 2010, there will be a full lunar eclipse visible from North America and many other areas. I recall there is a Gemara that says that a lunar eclipse is a bad omen for the Jews as ...
2
votes
2answers
195 views

Why is my molad-time chart off by a day?

The HaMaor Mikraos Gedolos chumash has a chart of molad (forecasted first visibility of the new moon in Jerusalem, based on averages observable to the naked eye, assuming Jerusalem local time; am I ...