Most of the time the stock market is or close to a top one day before or one day after New Moon and then follows a few down days. Jan 5 was New Moon and this might partially explain last Friday's strong rally. If it would be true this time, a top might be seen either on Jan 4 or would be seen on Monday, Jan 7. Of course, sometimes New Moon relates to the bottom of markets as well but as you can see on the chart, more than 80% of the time New Moon correlates market's top.
On the other hand, Full Moon correlates market's down days, bottom out and then strong rally most of the time.
Tradingview's Moon Phace indicator is useful displaying New Moon and Full Moon on charts. It would be even better if this indicator could show future New Moon or Full Moon on charts in advance.
I use the lunar cycles and its a great tool to analyze the stock and other markets.