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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Sensu is a Latin word meaning in the sense of. It is used in a number of fields including biology, geology, linguistics, and law.mith, or  sensu Smith), indicating that the intended meaning is the one defined by that author. (Here  sec . is an abbreviation of  secundum , meaning following or in accordance with.) Such an author citation is different from the citation of the nomenclatural author citation or authority citation .