Based on Shulchan Arukh OC 568:1-2, if someone forgot and ate on a fast day with a fixed date, he doesn't have to fast a different day instead, and the communal Bahab in Iyar and Marcheshvan is considered a fast day with a fixed date (as opposed to accepting on yourself to arbitrarily fast a personal Bahab some other time, where if you missed a day you could ...
The לוח דבר בעיתו explains (regarding Rosh Chodesh Iyar 5769) that the reason we don't announce בה"ב on Rosh Chodesh is that:
אין מברכים את המתענים בה"ב בחדש ניסן או בשבת ר"ח, השבת הקרובה, כמו שנאמר (קהלת ז, יד) "בְּיוֹם טוֹבָה - הֱיֵה בְטוֹב", ומברכים בשבת שלאחריה.
I.e. In a time of good fortune, enjoy the good fortune (Koheles 7:14) - so we don't ...
In Iran, the milk in the city I'm from was all procured by non-jews. So unless you bought a whole cow for pesah, you wouldn't have dairy because there was no means of verifying if there was hametz in the milk.
I have not tried to research this excellent question, but my initial thought is that it follows the dual ritual of the Seder- remembering the slavery AND remembering the freedom. For example: Matzoh is BOTH poor man's bread (representing the slavery) AND freedom bread (not enough time to bake). Many of the other rituals refer to one or the other (or both).
As per the Oz V’hadar extended Mesivta Haggadah, page 826:
The Sefer Leil Shimmurim (by Rabbi Yechiel Epstein, author of the Aruch HaShulchan) writes that the eleven stars correspond to the seven “planets” (sun, moon, Mercury, Mars, Jupiter, Venus, and Saturn) plus the four elements (earth, fire, water, and air). Similarly the Bnei Yissaschar writes that ...
Menachot 65b cites 4 Tan'aim who provide 4 explanations to reconcile these 2 verses:
(1) Rabbi Eliezer
(2) Rabbi Yehoshua
(3) Rabbi Yishmael
(4) Rabbi Yehuda ben Betera.
Rabbi Yishmael says there is another refutation of the Boethusian interpretation. The Torah said: Bring the omer offering on the festival on Passover and the two loaves on Shavuot. ...
The eleven refer to the stars of Yosef's dream rather than all of the tribes.
אַחַד עָשָׂר מִי יוֹדֵעַ? אַחַד עָשָׂר אֲנִי יוֹדֵעַ: אַחַד עַָשָׂר
Twelve on the other hand refers to the actual tribes.
שְׁנֵים עָשָׂר מִי יודע? שנים עָשָׂר אֲנִי יוֹדֵעַ: שְׁנֵים עֶָשָׂר
While the interpretation of the dream says that the ...