The convention of skipping asana practice on full and new moon days is most closely associated with Ashtanga yoga as taught by K. Pattabhi Jois (1915–2009) at his shala in Mysore, India. Students following the Mysore method — a self-paced practice done under a teacher's supervision, six days a week — traditionally do not practice on chandra darshan (new moon) or purnima (full moon) days.
Where the idea comes from
The moon-day rest convention draws on older ideas in Vedic and yogic thought that predate modern Ashtanga by centuries. Two threads run through it:
- The tidal argument. The moon's gravity visibly moves the ocean's tides. Given the human body is roughly 60% water, the same reasoning is extended to the body — the idea that lunar gravity affects internal fluids and, by extension, physical and emotional stability, particularly around full and new moon.
- The Panchanga (Vedic calendar). Traditional Vedic astrology treats the lunar day (tithi) as a meaningful unit of time, and certain tithis — including the full and new moon — are treated as auspicious for specific kinds of activity, with vigorous physical exertion generally discouraged.
The stated rationale, phase by phase
Within the tradition, the two moon days are treated differently rather than identically:
- Full moon (purnima): energy is considered to run high, expansive, and outward — practicing hard on top of that is thought to increase risk of injury or overexertion.
- New moon (amavasya): energy is considered to run low and inward — pushing against that state is thought to work against the body rather than with it.
How the practice spread
As Ashtanga spread globally from the 1970s onward through Jois's students, the moon-day convention traveled with it, and shalas worldwide continue to close on these days — often publishing a moon-day calendar alongside their regular schedule. Some other yoga lineages and individual teachers have adopted similar rest-day conventions, sometimes citing the same tidal and Panchanga reasoning, sometimes simply as an inherited scheduling norm.
A practical framing, independent of belief
Whether or not the tidal-gravity explanation holds up to scrutiny (it's a genuinely contested claim), the practical case for a built-in rest rhythm is harder to dismiss: a twice-monthly pause, fixed to a predictable calendar rather than negotiated in the moment, tends to produce a more sustainable long-term practice than one without any scheduled rest at all.
See what to do on a moon day instead of asana in our practice guide, or check the 2026 moon calendar for upcoming dates.