I often like to look at past moves to predict future moves. On Friday, we had a choppy sideways movement, followed by a late afternoon rally. The rally we had in the afternoon (right blue arrow) was exactly 2.618x (261.8%) of the rally we had in the morning (left blue arrow). To the tick! Also, notice the reaction around the 1.0 and 0.786 levels and a close near the 1.618 level.

Lesson