(no subject)

[arib]

So, why is it that the molad and rosh chodesh aren't lining up anymore?

Comments

[rikhei.livejournal.com]

Could you please explain this to those of us who have no idea what you're talking about?

[sethg]

Molad: prediction, based on a formula going back about two thousand years, of when the astronomical new moon will occur.

Rosh chodesh: the first day of the new month according to the Jewish calendar that was established at the same time.

[meglimir.livejournal.com]

There's a pretty good explanation at Torah Tidbits.

[cellio]

I assume it's a side effect from trying to ensure that certain holidays do not fall on certain days of the week, but that's just a guess.