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From Tibetan Buddhist Encyclopedia
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The Uposatha (Sanskrit: Upavasatha) is Buddhist day of observance, in existence from the Buddha's time (500 BCE), and still being kept today in Buddhist countries. The Buddha taught that the Uposatha day is for "the cleansing of the defiled mind," resulting in inner calm and joy. On this day, lay disciples and monks intensify their practice, deepen their knowledge and express communal commitment through millennia-old acts of lay-monastic reciprocity. On these days, the lay followers make a conscious effort to keep the Five Precepts or sometimes the 8-precepts. It is a day for practicing the Buddha's teachings and meditation.

Observance days

Depending on the culture and time period, uposatha days have been observed from two to six days each lunar month.

Theravada countries

In general, Uposatha is observed about once a week in Theravada countries in accordance with the four phases of the moon: the new moon, the full moon, and the two quarter moons in between. In some communities, such as in Sri Lanka, only the new moon and full moon are observed as uposatha days.

In Burma, Uposatha (called ဥပုသ် ubot nei) is observed by more pious Buddhists on the following days: waxing moon (လဆန်း la hsan), full moon (လပြည့်နေ့ la pyei nei), waning moon (လဆုတ် la hsote), and new moon (လကွယ်နေ့ la kwe nei). The most common days of observance are the full moon and the new moon. In pre-colonial Burma, the Uposatha day (commonly rendered as the Buddhist Sabbath in English) was a legal holiday that was observed primarily in urban areas, where secular activities like business transactions came to a halt. However, since colonial rule, Sunday has replaced the Uposatha day as the legal day of rest. All major Burmese Buddhist holidays occur on Uposatha days, namely Thingyan, the beginning of the Buddhist lent (beginning in the full moon of Waso, around July to the full moon of Thadingyut, around October). During this period, Uposatha is more commonly observed by Buddhists than during the rest of the year. During Uposatha days, Buddhist monks at each monastery assemble and recite the Patimokkha (a concise compilation of the Vinaya.

For a 2012 calendar of Thai uposatha days, see John Bullitt's "Calendar of Uposatha Days."

Mahayana countries

In Mahayana countries that use the Chinese calendar, the Uposatha days are observed six times a month, on the 8th, 14th, 15th, 23rd and final two days of each lunar month. In Japan, these six days are known as the roku sainichi; (六斎日; Six Days of Fasting?).

Names of Full Moon Uposatha Days

The Pali names of the uposatha days are based on the Sanskrit names of the nakśatra (Pali: nakkhatta), the constellations or lunar mansions through which the moon passes within a lunar month.

Full Moon Uposatha Day Names
Associated Month Pali Sanskrit Burmese Sinhala Thai
January Phussa Puṣya Pyatho Duruthu Pusaya (ปุศยะ)
February Māgha Maghā Tabodwe Navam Makha (มาฆะ)
March Phagguṇa Phalgunī Tabaung Medin (Maedhin) Pholkuni (ผลคุณี)
April Citta Chitrā Tagu Bak Chittra (จิตรา)
May Visākhā Viśākhā Kason Vesak Visakha (วิสาขา)
June Jeṭṭhā Jyeṣṭha Nayon Poson Chetta (เชษฐา)
July Āsāḷhā Aṣāḍhā Waso Esala (Aesala) Asarnha (อาสาฬหะ)
August Sāvana Śrāvaṇa Wagaung Nikini Savana (สาวนะ)
September Poṭṭhapāda Bhādrapadā Tawthalin Binara Phattarapratha (ภัทรปทา)
October Assayuja Aśvinī Thadingyut Vap Assavani (อัศวนี)
November Kattikā Kṛttikā Tazaungmon Il Krittika (กฤติกา)
December Māgasira Mṛgaśiras Natdaw Unduvap Maruekasira (มฤคศิระ)


The word "uposatha" is derived from the Sanskrit word "upavasatha," which refers to the pre-Buddhistic fast day that preceded Vedic sacrifices.

In the Buddha's time, some ascetics used the new and full moon as opportunities to present their teachings. The Uposatha Day was instituted by the Buddha at the request of King Bimbisara, and the Buddha instructed the monks to give teachings to the laypeople on this day, and told the monks to recite the Patimokkha every second Uposatha day.


Lay practice

On each uposatha day, devout lay people practice the Eight Precepts.

For lay practitioners who live near a monastery, the uposatha is an opportunity for them to visit a local monastery, make offerings, listen to Dhamma talks by monks and participate in meditation sessions.

For lay practitioners unable to participate in the events of a local monastery, the uposatha is a time to intensify one's own meditation and Dhamma practice, for instance, meditating an extra session or for a longer time, reading or chanting special suttas, recollecting or giving in some special way.

Monastic practice

On the new-moon and full-moon uposatha, in monasteries where there are four or more bhikkhus, the local Sangha will recite the Patimokkha. Before the recitation starts, the monks will confess any violations of the disciplinary rules to another monk or to the Sangha. Depending on the speed of the Patimokkha chanter (one of the monks), the recitation may take from 30 minutes to over an hour. Depending on the monastery, lay people may or may not be allowed to attend.

Communal reciprocity

Describing his experience of Uposatha day in Thailand, Khantipalo (1982a) writes:

"Early in the morning lay people give almsfood to the bhikkhus who may be walking on almsround, invited to a layman's house, or the lay people may take the food to the monastery. Usually lay people do not eat before serving their food to the bhikkhus and they may eat only once that day.... Before the meal the laity request the Eight Precepts [from the bhikkhus] ..., which they promise to undertake for a day and night. It is usual for lay people to go to the local monastery and to spend all day and night there.... [In monasteries where] there is more study, lay people will hear as many as three or four discourses on Dhamma delivered by senior bhikkhus and they will have books to read and perhaps classes on Abhidhamma to attend.... In a meditation monastery ..., most of their time will be spent mindfully employed – walking and seated meditation with some time given to helping the bhikkhus with their daily duties. So the whole of this day and night (and enthusiastic lay people restrict their sleep) is given over to Dhamma...."

Special uposatha days

In Thailand five full-moon uposatha days are of special significance and are called puja, 'days of worship', :

  • Pavarana Day:
    the end of the Rains Retreat residence during which time each monk atones before the Sangha for any offense they may have committed.

In Sri Lanka three full moon Uposatha or Poya days are of special significance.

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1. Observance of the Eight Precepts;

2. Bi-weekly recitation of the Vinaya rules by a chapter of Buddhist monks

The uposatha are the days of the full moon, half moon and the two quarter moons of each month in the ancient Indian calendar. The day of the full moon (puṇṇamā) was the most important uposatha and marked the beginning of the month. In pre-Buddhist times the upavasatha was the fasting day preceding the Vedic sacrifice. This Sanskrit word and its Pāḷi equivalent mean something like ‘fulfilled.’ In some ways the uposatha is similar to the Jewish and Christian Sabbath, except, of course, that it is not obligatory to observe it. However, the Buddha certainly recommended lay Buddhists use these holidays to ‘purify the soiled mind in the right way’ (upakkilittassa cittassa upakkamena pariyodapanaA.I,207). He encouraged them to pay homage to their parents on such days, to do good works, spend timein quiet contemplation and abide by the eight Precepts (A.I,143; 207). To use the uposatha for such activities was, he said, like polishing a tarnished mirror (A,I,209). He praised reserving the uposatha days for such activities in these words: ‘Pearl, crystal, beryl and gold are not worth a sixteenth of the uposatha made whole with the eight Precepts. Nor is it outshone by the moon and the celestial bodies.’ (A.I,215).

Until the introduction of the Gregorian calendar in most Buddhist countries, the uposathas were public holidays. In Sinhalese they are called poya, in Burmese ubot nei, in Chinese shuo wang, and in Japanese roku sainichi. Monks and nuns use the full and half moon uposathas to chant the Pātimokkha in congregation.