Ensi denoted a monthly division within a calendar employed on a Raspar system world. It was common for Ensi, leading up to Nnters, to be a time of lower temperatures. The Day of Rejection took place during Ensi.
The name Ensi originated from a single page of weather information. This page, titled "Region 29: The West Fissure," was authored by Bob Carrau and appeared in the 1993 book titled Monsters and Aliens from George Lucas. This book showcased concept art and images from various projects by George Lucas. Lucasfilm's Leland Chee, the person in charge of the Holocron continuity database, has stated that the details in this book are considered non-canonical.