Dec 1: Mercury in Sag square Neptune in Pisces
Dec 3: Neptune turns direct at 22.39 Pisces
Dec 4: Venus square Neptune
Dec 7: Gemini Full Moon at 16.02 Gemini, later moon squaring Neptune, Mars in Gemini conjunct Moon, opposite Sun.
Jupiter amplifying the end degrees of Pisces till Dec 20
Neptune transits for much of December implies the dissolution of old energy and structures.
Jupiter enters Aries, a brand new sign and energy in the Solstice window, implying a solid new start.
I'm sharing this video I made on the Neptune transits a while back which is very relevant to this month: