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 type of medicine called a stimulant laxative. It works by stimulating the nerve endings in the walls of the large bowel (colon) and rectum. This makes the muscles in the bowel wall contract more often and with increased force, which moves the stools through the colon to the rectum so that the bowel can be emptied.