The period between day and night is considered a magical time by the Fianna, a transitory time when the world grows still and the hidden dances almost within vision.
The Fiann must howl or play a mournful tune just before sunrise and just after sunset every day for nine days. The Garou then gains an additional die when attempting to cross or see through the Gauntlet. The bonus lasts until the Fiann fails to perform the ritual; she must then perform it for nine more days before regaining the benefits.
Source: Tribebook Fianna Revised