People always ask about the time.
Some only want to know the time to the nearest quarter hour. Some want the time to the exact second - and they want it correct. Now you people in the second category can visit the Atomic Clock at the US Naval Observatory and get the 'official' correct time to the nearest second. Similar to the exact current time, people often want to know about things like the times that sun rises and sets . This like will give them a yearly reading for a nearly anyplace in the world.