Today, Christmas Day, is also the fifth night of Hanukkah. The fifth night is considered to be somewhat special because at that point there is enough light from the candles to light the room. Hanukkah is also called the Feast of Lights. The origin of the name may actually be due to Halley's comet, which would have appeared in the night sky in 163BC. That's just about right for the rededication of the temple in Jerusalem.