Moon and the menstrual cycle
13 October 2026 at 12:00 BST: waxing crescent, 8.1% illuminated, 2.80 days since new Moon.
- Phase
- Waxing Crescent
- Illumination
- 8.13%
- Lunar age
- 2.798 days
- Phase angle
- 32.71°
- Earth–Moon distance
- 398,069 km
- Brown lunation
- 1284
Two different cycles
A lunar phase cycle averages 29.53 days. Menstrual cycle length varies between people and from one cycle to another. In a 2021 study of 529 women aged 25–39, menstrual onset had no overall association with lunar phase.
Enter a recorded cycle-start date above to label it with its actual Moon phase. Tracking records a past event; a Moon phase does not determine ovulation, a fertile window or contraception timing.