Tefillah Geshem on Shemini Atzeret

TEFILLAH GESHEM

Children artwork of raindrops on autumn leaves glued on paper

Shemini Atzeret, meaning "the eighth day of assembly," is a Biblical Jewish holiday that follows the Jewish festival of Sukkot. It is written: "On the eighth day you should hold a solemn gathering; you shall not work at your occupation".
Shemini Atzeret marks the beginning of the rainy season following the harvest in Israel.
The prayer for rain, Tefilat Geshem, is the only ritual that is unique to Shemini Atzeret. In ancient times, an offering was brought to the Temple in Jerusalem on Shemini Atzeret. But once the Temple was destroyed, the only Shemini Atzeret ritual that remained was the liturgy requesting rain for a plentiful year.
After the prayer for rain is recited on Shemini Atzeret, the phrase Masheev HaRuach U-Moreed HaGeshem (He causes the wind to blow and the rain to fall) is inserted into the Amidah prayer until Passover.