How do you celebrate Noumenia on the night before? The night before is the dark of the moon, in all reality, so shouldn't it be Hene Kai Nea? But Hene Kai Nea is the night/day before the dark of the moon, then Noumenia starts on the night of the dark of the moon and ends the next day. How are we celebrating the first sighting of the moon if we are doing it before the moon ever appears in the sky and we say the day is over before the moon has a chance to appear? That makes no sense to me.
One of the most important and confusing of the many Hellenic festivals is the three-day transition from month to month. Although unlinked, the Deipnon, the Noumenia and AgathĂłs DaĂmĹn are held on consecutive days, around the new moon. Especially the placement of the days is hard to get right; at least, it was for me.
The Deipnon (Hene kai Nea)âor Hekateâs Deipnonâis celebrated any time before the first sliver of the new moon is visible. In practice, this is the day after the new moon. The Noumenia is held the day after that, when the moon has become visible again, and AgathĂłs DaĂmĹn the day after that. It is important to note that the ancient Hellens started a new day at sundown the day before. Instead of starting a new day at midnightâor in the morningâlike we do today, they started it at sundown of the previous day. This means thatâwhen applied to modern practiceâthe Deipnon starts on the day of the suspected new moon, and the rest follows after, to the total of four days. Confused yet? How about a schematic. In this example, weâll assume that the sun goes down at six P.M. on all days.
Day 1: All day - (suspected) new moon6 P.M. - start of the Deipnon (Deipnon night)
Day 2:All day - day after the new moon6 P.M. day 1 to 6 P.M. day 2 - Deipnon (Deipnon day)6 P.M. - start of the Noumenia (Noumenia night)
Day 3:All day - second day after the new moon6 P.M. day 2 to 6 P.M. day 3 - Noumenia (Noumenia day)6 P.M. - start of  AgathĂłs DaĂmĹn (AgathĂłs DaĂmĹn night)
Day 4:All day - third day after the new moon6 P.M. day 3 to 6 P.M. day 4 - AgathĂłs DaĂmĹn (AgathĂłs DaĂmĹn day)
In general, you celebrate the Deipnon at night time on the day of the Deipnon, so after sundown on day one. Many Hellenists spent the day of the Deipnon (day two, until sundown) cleaning and taking out things like the recyclables; getting everything ready for the new month. The Noumenia starts at sundown on day two. Typically the bulk of the Noumenia rituals is done in the daylight hours, so on day three until sundown. Personally, I do a nighttime ritual on day two after sundown for Selene, as She is a moon Goddess and honoring Her when the first sliver of Her becomes visible is important to me. I also honor Her during the daytime on day three. At sundown on day three, AgathĂłs DaĂmĹn starts. The ritual aspects are usually held in the daylight hours, so on day four, until sundown.
I hope this makes it clearer!