The Moon is emotional and Saturn is logical and in a hard aspect in synastry like an opposition or square, their natures are certainly at odds with one another. That being said, everything in astrology exists in a spectrum of experience and there are positives and negatives that must be considered.
Lo Saturnalia! In ancient Rome, the wild, naughty street festival of Saturnalia was a lavish harvest holiday, at one point lasting a full week, marked by December 17. Historically, this is the earliest example we have of gift giving at this time of year and is one of the many pagan ancestors of Christmas as we now know.