Uposatha

History

The word "Uposatha" derives from the Muluposatha Sutta (AN 3.70), in which a lay woman named Visakha, visited the Lord Buddha and says she is observing the Uposatha day. The Lord Buddha replies that there are different Uposatha days, then proceeds to tell her the correct version of the Uposatha day, the Uposatha of the Noble Disciples.

Practice

Lay practice

On each uposatha day, devout Upāsaka and Upāsikā practice the Eight Precepts, perhaps echoing the Buddha's teaching that laypeople should "imitate" arhats on Uposatha days. The first five of the eight precepts are similar to the five precepts, that is, to refrain from killing living beings, stealing, wrong speech and to abstain from intoxicating drink or drugs, but the third precept is abstinence of all sexual activity instead of refraining from sexual offenses. The eight precepts are similar to the ten precepts observed by novice monks, except that the seventh and eighth precepts for the novices are combined, the ninth novice precept becomes the eighth, and the tenth novice precept (non-acceptance of gold and silver, use of money) is excluded as being impracticable for a lay person. Thus, the final three precepts are to abstain from eating at the wrong time (after midday); to abstain from entertainment such as dancing, singing, music, watching shows, as well as to abstain from wearing garlands, perfumes, cosmetics, and personal adornments; and to abstain from luxurious seats and beds.

For lay practitioners who live near a Buddhist temple, the uposatha is an opportunity for them to visit it, make offerings, listen to sermons 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 Buddhist texts, recollecting or giving in some special way.

Presently, the uposatha vows are mostly associated with Theravāda Buddhism in South and Southeast Asia, but it was a widespread practice in China as well, and is still practiced.

The eight precepts are meant to give lay people an impression of what it means to live as a monastic, and the precepts "may function as the thin end of a wedge for attracting some to monastic life." The objective of the eight precepts is different from the five in that they are less moral in nature, but more focused on developing meditative concentration, and preventing distractions. Among the eight precepts, the third precept is about maintaining chastity. Buddhist tradition therefore requires lay people to be chaste on observance days, which is similar to the historical Indian tradition of being chaste on parvan days. As for the sixth rule, this means not having food after midday, in imitation of a nearly identical rule for monks. Fluids are allowed. Taiwanese physician Ming-Jun Hung and his co-authors have analyzed early and medieval Chinese Buddhist Texts and argue that the main purposes of the half-day fast is to lessen desire, improve fitness and strength, and decrease sleepiness. Historically, Chinese Buddhists have interpreted the eight precepts as including vegetarianism.

The seventh precept is sometimes also interpreted to mean not wearing colorful clothes, which has led to a tradition for people to wear plain white when observing the eight precepts. This does not necessarily mean, however, that a Buddhist devotee dressed in white is observing the eight precepts all the time. As for the eighth precept, not sitting or sleeping on luxurious seats or beds, this usually comes down to sleeping on a mat on the floor. Though not specified in the precepts themselves, in Thailand and China, people observing the precepts usually stay in the temple overnight. This is to prevent temptations at home which break the eight precepts, and helps foster the community effort in upholding the precepts.

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 days 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:

• Visakha Puja or Visakha Uposatha or Vesak ("Buddha Day") is the most sacred Buddhist holiday. It is the anniversary of the Buddha's birth, awakening and parinibbana.
• Asalha Puja or Asalha Uposatha ("Dhamma Day") is the anniversary of the Buddha's delivering his first discourse, which is collected as the Dhammacakkappavattana Sutta. The three-month-long Vassa retreat starts the following day.
• Pavarana is the end of the Rains Retreat residence during which time each monk atones before the Sangha for any offense they may have committed.
• Anapanasati Day is the anniversary of the Buddha's delivering the Anapanasati Sutta. This event is not connected to an Uposatha (Poya) day in Sri Lanka and perhaps is particular to Thailand.
• Magha Puja or Magha Uposatha ("Sangha Day") is the anniversary of the assembling of 1250 monks in the Buddha's presence during which time he delivered the "Ovada-Patimokkha Gatha."

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

• Vesak Poya, which is described above.
• Poson Poya corresponds to the Jeṭṭhā uposatha, which falls in June. It is of special significance in Sri Lanka because the monk Mahinda, Asoka's son, officially introduced Buddhism to Sri Lanka on this day in the 3rd century B.C.
• Esala Poya corresponds to Āsāḷhā uposatha, the full moon of July, and is described above. This day has special significance in Sri Lanka because it was the day that 56 nobles, headed by Prince Ariṭṭha, became the first Sri Lankans to be fully ordained as bhikkhus at Cetiyagiri in Mihintale by Mahinda and his companions. It therefore marks the founding of the Sri Lankan Bhikkhu Sangha.

In Tibet and Bhutan, there are four full moon Uposatha days that are of importance

• Chotrul Duchen
• Saga Dawa Duchen
• Chokhor Duchen
• Lhabab Duchen

In China, Japan, Korea, the Philippines and Vietnam there are certain full moon Uposatha days of importance.

• First Full Moon Festival, which is celebrated in Buddhist temples and also acknowledges the end of the Lunar New Year.
• Buddha's Birthday/Vesak