Mid-Autumn Festival of the Hindu lunar month of Ashvin (September–October), marking the end of the monsoon season. In Sri Lanka, a full moon day is known as "Poya" and each full moon day is a public holiday. Shops and businesses are closed on these days as people prepare for the full moon. Exteriors of buildings are adorned with lanterns and people often make food and go to the temple to listen to sermons. The "Binara Full Moon Poya Day" and "Vap Full Moon Poya Day" occur around the time of the Mid-Autumn Festival and like other Buddhist Asian countries, the festivals celebrate
Equinox zero. Its latitude will not be exactly zero, since Earth is not exactly in the plane of the ecliptic. Its declination will not be exactly zero either. (The ecliptic is defined by the barycenter of Earth and the Moon combined.) The modern definition of equinox is the instants when the Sun's apparent geocentric longitude is 0° (northward equinox) or 180° (southward equinox). See the adjacent diagram. Because of the precession of the Earth's axis, the position of the vernal point on the celestial sphere changes over time, and the equatorial and the ecliptic coordinate systems change accordingly. Thus when specifying