Periwinkle at the Full Moon Ball Periwinkle at the Full Moon Ball Periwinkle at the Full Moon Ball () is the first book in the "Beechwood Bunny Tales" series. It was originally published by France's Éditions Milan in 1987, and in the United States by Gareth Stevens in 1991. In its native country, the book won the Prix Saint-Exupéry for 1988, and the Prix de la Ville de Paris for its author. A young rabbit named Periwinkle Bellflower ("Agaric Passiflore" in the French version) learns of the summertime Full Moon Ball that will soon take place in the community of Beechwood Grove. Unlike the other rabbits
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