Earth tide lunar and the solar tidal maxima and minima (bulges and depressions) add together for the greatest tidal range at particular latitudes. At first- and third-quarter phases of the moon, lunar and solar tides are perpendicular, and the tidal range is at a minimum. The semi-diurnal tides go through one full cycle (a high and low tide) about once every 12 hours and one full cycle of maximum height (a spring and neap tide) about once every 14 days. The development of a systematic theory of Earth tides was started by George H. Darwin in 1879, and was then furthered by
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