Siman - Berachos Daf 27

  • The latest time to daven Minchah

Since the Gemara does not render the halachah regarding the latest permissible time to daven Minchah, one may follow the opinion either of the Rabbanan and daven until nightfall, or of R’ Yehudah and daven until plag Haminchah (10 ¾ seasonal hours into the day). R’ Yehudah also permits one to daven Maariv right after plag Haminchah, even though it’s before nightfall.

-         According to many, one may not, however, do a split decision, following the Rabbanan to daven Minchah after plag and then following R’ Yehudah to immediately daven Maariv before nightfall.

  • Walking in front of someone davening Shemoneh Esrei      

One may not pass in front of someone who is davening Shemoneh Esrei - אסור לעבור כנגד המתפללין.

- Furthermore, one may not daven either alongside or behind his Rebbi, as doing so would appear arrogant.

  • R’ Gamliel is deposed

The Gemara relates that the machlokes between R’ Gamliel and R’ Yehoshua over whether Maariv is voluntary or obligatory led to R’ Gamliel being deposed and R’ Elazar ben Azarya being appointed Nasi in his place.