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 Yom Kippur Musaf Service includes two services: the Avodah service and the Martyrology service. Musaf follows Yizkor and Torah reading.
For most people, Rosh Hashanah means a lot of time spent praying in the synagogue. These are the complex explanations behind those prayers.