After A Week On Android, Vine Surpasses Instagram On Google Play Charts As Top Social App. After months of speculation, the fate of Waze, the social-mapping-location-data startup, is finally decided: Google is buying the company, giving the search giant a social boost to its already-strong mapping and mobile businesses.
The GPS satellites are not in geo-stationary orbit, but instead orbit twice every time the Earth rotates once. This means that for any observer the satellites appear to orbit once overhead each day.
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.