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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(Redirected from Senokot). Senna glycoside, also known as sennoside or senna, is a type of medication used to treat constipation or empty the large intestine before surgery. The medication is taken by mouth or via the rectum.It typically begins working in minutes when given by rectum and within twelve hours when given by mouth.enna derivatives are a type of stimulant laxative. While its mechanism of action is not entirely clear, senna is thought to act by increasing fluid secretion within and contraction of the large intestine.