Lunar Structure

Lunar Structure (M1–M13)

The Light Calendar includes a simple moon cycle index.
Each lunar cycle belongs to the year in which its full moon occurs.

Rules

• Luna numbering: M1–M13
• A lunar cycle begins at the astronomical new moon, rounded by a natural rule:
  • New moon before 12:00 UTC → previous night
  • After 12:00 UTC → same day
• Users see the moon day in their own timezone.

Example Notation