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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In Irish, the name Senan means-hero of the people.The name Senan originated as an Irish name. The name Senan is most often used as a boy name or male name. Irish Name Meaning-hero of the people. Origin-Ireland. Global Star Registery-Name a star after someone special!