There is something about the shadow of the upcoming events or arriving at a destination that colors one's present day.
This is true with Transfiguration. I've been reading a great deal of Mt. Sinai and Moses for my on-line course, Intro to the Old Testament. The relationship of God and the people of Israel is thick as blood, and just as ornery sometimes.
Yet there is something of Moses' pilgrimage to the top of Mt. Sinai, shrouded in the mist and light of God, that is echoed in the Lucan account of Transfiguration. Moses, Elijah, and Jesus, all bathed in the light of God. It mimics Moses and Elijah's account of meeting the Holy on the top of Mt. Sinai.
This story already pulls me forward toward not only toward Transfiguration Sunday, but Shrove Tuesday and Ash Wednesday: the beginning of Lent.