The Apollo 8 journey into the moon’s orbit gave a fractured America something to cheer as a tumultuous year came to an end — The eight-foot-tall white spruce was an exquisitely well-shaped Christmas tree, no low hanging branches, full throughout the middle, and then tapered up to a perfectly symmetrical triangle. Naturally, it was trimmed just the way Olivia McDonald liked it with white lights wrapped all the way around, decades-old homemade ornaments dangling…