Live lunar tracking paired with the 13 month calendar. Today's phase, the next new moon and full moon, and the coming waxing and waning windows — every Gregorian date below is paired with its 13 month calendar equivalent. See also is the 13 month calendar lunar?, the Sol month, and the 13 month calendar date converter.
Next New Moon
August 12, 2026
July 28 · 13-month
in 9 days
Next Full Moon
August 27, 2026
August 15 · 13-month
in 24 days
Next Waxing Window
August 12 – August 20, 2026
July 28 – August 8 · 13-month
starts in 9 days
Next Waning Window
August 27 – September 3, 2026
August 15 – August 22 · 13-month
starts in 24 days
Tonight: Waning Gibbous · 81% illuminated · August 3, 2026 (July 19 · 13-month)
The full lunar synodic cycle takes about 29.5 days from one new moon to the next, passing through eight recognizable phases along the way.
Next New Moon: August 12, 2026 (July 28 · 13-month) — in 9 days.
The new moon marks the start of a fresh lunar cycle, when the moon sits between Earth and the sun and its illuminated face is turned away from us.
Next Full Moon: August 27, 2026 (August 15 · 13-month) — in 24 days.
The full moon falls roughly halfway through the cycle, when Earth sits between the sun and the moon and the entire near side is lit.
Next Waxing Window: August 12 – August 20, 2026 (July 28 – August 8 · 13-month) — starts in 9 days.
The waxing window runs from new moon to first quarter — a time of building light, traditionally associated with growth, planning, and gathering energy for what comes next.
Next Waning Window: August 27 – September 3, 2026 (August 15 – August 22 · 13-month) — starts in 24 days.
The waning window runs from full moon to last quarter — a time of releasing light, traditionally associated with rest, reflection, and letting go.
Every lunar cycle moves through eight named phases. Four are major: new moon, first quarter, full moon, and last quarter. Between them sit four intermediate phases: waxing crescent, waxing gibbous, waning gibbous, and waning crescent. "Waxing" means the lit portion is growing; "waning" means it is shrinking. "Crescent" describes a sliver less than half-lit; "gibbous" describes a shape more than half-lit but not yet full.
The whole sequence repeats every 29.530588 days on average — what astronomers call the synodic month. This is the cycle that almost every lunar tradition, from agricultural folk calendars to fasting protocols, has followed for thousands of years.
The 13-month fixed calendar uses months of exactly 28 days — a clean four-week block. The actual moon cycle is closer to 29.5 days, so the two don't lock perfectly: the moon drifts about 1.5 days later inside each fixed month. But the structural similarity is striking. A 28-day month gives you a stable, repeatable container that roughly tracks the moon, without trying to chase it the way a true lunar calendar (like the Islamic Hijri calendar) does.
If you want the rational, perpetual structure of a 13-month year and a tighter relationship with actual moon phases, you can use this tracker as the live overlay: the fixed calendar gives you the grid, and the moon phase data gives you the rhythm.
Read more about how the 13-month calendar relates to the moon, and try a moon-aligned protocol for yourself.