For units in astronomy, see astronomical system of units. The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year.
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Senna is a flowering bush common in the tropics, with bright yellow flowers. In herbal medicine, Senna has gained some notice as the active ingredient in so-called dieter's teas, which works mainly as a laxative.