Local apparent sidereal time as a mixed h-m-s right-ascension Quantity
SiderealTime[]
SiderealTime[date]
SiderealTime[loc]
SiderealTime[loc, date]
SiderealTime[{{loc1, date1}, {loc2, date2}, …}]
SiderealTime["MeanTime", loc, date]
SiderealTime[type, loc, date, func]