Timesense (sage ability)

Timesense is an amateur-status sage ability in the study of Natural Astronomy, which allows the character to know, when above ground and able to view the sky, the approximate time of day within thirty minutes. The ability also conveys knowledge of the exact moment of sunrise and sunset. As either approach, accurate prediction improves. The exact time will be known during each two hour period before and after sunset and sunrise.

This knowledge can only falter if the knowledgeable character moves underground, remains inside without natural light or is made somehow blind.