Atthami Quarter Moon – Uposatha Observance (Renewed Dedication Practice Day)
Atthami is the waning Quarter Moon* this month, one of the four key days of Uposatha Observance, or a Renewed Dedication Practice Day for monastics and lay practitioners alike.
Paritta chants in Pali are strongly recommended on Uposatha Observance Days. Here is a beautiful playlist of Pali Parittas, wonderfully chanted (turn on subtitles to chant along) by the @3GemsBand:
Uposatha Observance Days
The Lunar Observance Days – General Practices
Four days each month aligned with the moon’s phases: New Moon (Amavasya), Full Moon (Pannarasi), and the two Quarter Moons (Atthami). These are traditional Buddhist days for intensified practice, observed since the Buddha’s time
The Uposatha Monthly Dates for September 2026
Sep 4 — Quarter Moon (Atthami)
Sep 11 — New Moon (Amavasya)
Sep 19 — Quarter Moon (Atthami)
Sep 26 — Full Moon (Pannarasi)
“Cleanse the Defiled Mind”
Uposatha means “observance” — a day to “cleanse the defiled mind.” For monastics, New and Full Moons are for reciting the monastic rules (Patimokkha). For laypeople, these days are an invitation to step more fully onto the path, renewing commitment to the Dhamma through heightened ethics, meditation, and reflection.
Recommended Practices
- Eight Precepts — for the day. Alternately, strictly observe the lay precepts, of which there are five.
- Observe a higher moral discipline: refrain from killing, stealing, sexual activity, false speech, intoxicants, eating after midday, entertainment and adornments, and luxurious beds. Wearing simple white clothing is a common symbol of this commitment.
- Visit a Monastery — Make offerings, listen to teachings, meditate with others, and join in chanting. In many traditions, laypeople stay overnight.
- Home Practice — Extend meditation sessions, chant protective suttas, study Dhamma texts, and practice generosity (dāna).
Suggested Suttas and Parittas
- Visakhuposatha Sutta (AN 8.43) — Direct teaching on the Uposatha with the Eight Precepts.
- Muluposatha Sutta (AN 3.70) — Explains different types of Uposatha observance and the Noble Disciple’s approach.
- Karaniya-metta Sutta (Sn 1.8) — Loving-kindness meditation; widely chanted for protection.
- Maha-mangala Sutta (Sn 2.4) — The highest blessings in life, from ethics to Nibbāna.
- Ratana Sutta (Sn 2.1) — Celebrates the Triple Gem (Buddha, Dhamma, Sangha) as the supreme refuge.
- Dhammacakkappavattana Sutta (SN 56.11) — The Buddha’s first discourse on the Four Noble Truths and Noble Eightfold Path.
Spirit of the Observance
The Uposatha is not about rigid rule-keeping. It is a regular rhythm of renewal — a chance to step back from ordinary routines, calm the mind, and taste, even briefly, the flavor of the holy life. Whether at a monastery or at home, the intention is to re-energize commitment to the Dhamma and to join millions of practitioners worldwide in shared observance.
Citations (Plain Text)
AN 8.43 — Visakhuposatha Sutta (Anguttara Nikaya)
AN 3.70 — Muluposatha Sutta (Anguttara Nikaya)
Sn 1.8 — Karaniya-metta Sutta (Sutta Nipata)
Sn 2.4 — Maha-mangala Sutta (Sutta Nipata)
Sn 2.1 — Ratana Sutta (Sutta Nipata)
SN 56.11 — Dhammacakkappavattana Sutta (Samyutta Nikaya)
- *Because Theravada traditions (Thai Maha Nikaya, Dhammayut, Sri Lankan) calculate lunisolar variations slightly differently, these dates reflect standard universal lunar phases
Dharma Dates
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Amavasya New Moon Uposatha Observance (Renewed Dedication Practice Day)
Amavasya New Moon this month, one of the four key days of Uposatha Observance (In sanskrit Upavasatha which in Mahayana is Supreme Renewal Day) , or a Renewed Dedication Practice Day for monastics and lay practitioners alike. Seven Buddhas Paritta especially is a powerful renewal and purifying chant, here beautifully performed by 3 GemsBand: […]