Moon and the menstrual cycle
23 October 2026 at 12:00 BST: waxing gibbous, 91.0% illuminated, 12.80 days since new Moon.
- Phase
- Waxing Gibbous
- Illumination
- 90.95%
- Lunar age
- 12.798 days
- Phase angle
- 144.97°
- Earth–Moon distance
- 381,557 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.