Simḥat Torah means “the joy of Torah” and is the name for the day on which the annual cycle of Torah readings begins and ends.
The laws for lighting candles on Sh’mini Atzeret are similar to those for Shabbat. These laws also apply to Simḥat Torah.
How does the imagery of water and rain connect Shemini Atzreet and Simchat Torah? What can we learn from this?