Look at the two charts below for ETH and SPX (symbolize the two major market, Cryto and US).
Black is Full Moon
White is New Moon.
Bars between full and new moons are colored accordingly, as growing or waning.
Once you see a full moon (local bottom) then it will slowly fade and around 15-16 days later, you will see the moon round again. In astrology this is new moon (local top).
Do note that Moon Phase Theory shows the local bottom whereas Eclipse sees major bottom.