It is the day when the Historical Sakyamuni Buddha is fully enlighten, around 600 bc The Wesak day is special, because Buddha made a specific commitment: To Keep in touch with our world and its beings, every year on that particular day. Buddha is doing a special effort that day. The buddha's contact is particularly strong and effective on the mental fields of consciousness, altougth not exclusive to there. The 500 Arhats (Lo-han in chinese), are present, as well as many other representatives of various mental-streams, other buddhas and bodhisattvas, gather to increase light input and output. Buddha's purnima and paranirvana (birth and passing away), is also often celebrated the same day or near day, making it a "triple blessing".

Wesak is: The full moon when the sun is in the Taurus constellation.
It falls every year on the full Moon of May or April. Here we present it as the astronomical full moon, the actual Wesak moment.

Wesak is an englishized name of the Indian vedic luno-solar astronomic calendar, Vaishakha is sanskrit for Taurus, month of The Bull.
To represents the month of the Wesak, there are various spellings: Veshakha, Vaisakh, Wosak, Vesak, Vaisakha, Baishakha, and what not. In tibetan: Saga-dawa meaning Buddha's moon. The Wesak day is also called: Visakah Puja (puya), Buddha Poornima, Gurupurnima, or just Buddha day.

The festival actually extends a few days before and and after the full moon. In many part of buddhist Himalayas, the whole month between the wesak full moon and the following full moon, is celebrated as the Saga-Dawa. It is a special month of collaboration in all sphere of evolving human activities.

This is a significant question, as the impact of the wesak yearly contact affects the planet as a whole. Disciples of all schools Buddhist, Hindu, and even Christ followers, as well as other non-religious groups, use the Wesak period as a facilitating period of insight, used for the rest of the year in various works.

In Many Asian countries, particularly buddhist countries, the Wesak is also a holliday, and have a rich and active folklore surrounding it. However the official Wesak holliday changes according to each individual countries, often a weekend close to the astronomical full-moon. Buddhist temples around the world carry their business as usual, and often have ceremonies open to the public during that period.
In recent decades, it seems that the recognition of the wesak has spread spontaneously. Here are some examples:

• The United nations Headqurters observed the Wesak officially for the first time on year 2000.
• When Hong-Kong was absorbed back into China in 1997, The P.R.China government added one official public holiday, that of Wesak.
• In the west, some new age movements can be traced back at least 130 years ago, when westerners started to show serious interest in eastern philosophies.
• A number of Western and Eastern countries have seen Wesak activities and awareness increase.
• Many Christian groups recognize the Wesak, including the Vatican.
• Hindus, followers of the Sanata Dharma, have always recognized Wesak day throughout the ages.

During the time of the Buddha, the 7-days week did not exist as such. People were following rather periods of half-moons which lasted 14 to 15 days, 2 of which comprised one month. the lunar month is approximately 29 and a half day. Indeed the Buddha thus anchored his commitment using the calendar of that time. Altougth the exact day changes from a year to another, it is easy to follow, because the ancient vedic calendar is astronomically correct.

Members of various movements, and individuals, are following the Wesak in a form or another. For historical reasons, along the centuries, various groups often forgot other groups. Unity of purpose underlying them. Wether we congregate or not, we can follow the wesak. Our wish is that the underlying unity is not forgoten. There is no such thing as a wesak of buddhists, wesak of theosophists, wesak of hindus, wesak of christians, etc. There is one wesak. It was said: "Brotherhood is a fact in nature, not an ideal". Which we believe.