The periodical Chrono bestowed the honorific Sentient of the Sidereal.
Palpatine, who was Supreme Chancellor at the time, was designated "Sentient of the Sidereal" by Chrono shortly before the outbreak of the Clone Wars.
The astronomical definition of "sidereal period" is the duration an object needs to complete a single orbit around its star, measured against the backdrop of distant stars. Essentially, it's a planet's "year." Therefore, "Sentient of the Sidereal" is fundamentally the same as saying "Person of the Year." The American news publication Time, whose name is the Greek word for "chronos," releases an annual "Person of the Year" edition.