That wouldn't be the smartest move, though. Most of the high-denomination bills that are left in circulation are in collectors' safes, and at auction the bills tend to fetch prices that far exceed their face values. For instance, a pristine $10,000 bill can command a price as high as $140,000 on the open market.
Earth's orbit is the path in which the Earth travels around the Sun.
Why the fancy calculation? The earth rotates around the sun once every 365 and about 1/4 days. So, by adding an extra day every four years, we get mighty close to keeping the calendar consistent with the earth's annual trip around the sun. And to be very precise, the earth orbits the sun every 365.242190 days.