Science
fromFlowingData
1 week agoMechanics of GPS
GPS translates time into distance using satellite signals to determine location.
Lego Group design manager Maarten Simons whipped out a "Lego ruler" made of standard Lego bricks divided into segments that were each 10 Lego studs, or roughly 8cm (3.15 inches) long. He attached a Smart Brick to one end of the ruler, and dragged a second Smart Brick along its length. The Smart Bricks changed color every time another 10 ten studs was passed, exactly at the dividing lines of each segment.
If you're on the surface of Earthand I'm betting you arethere are many ways to reliably estimate the distance to some object. One we use almost subconsciously is to compare an object's apparent size with how big we know it to be. For example, you have a good feel for the size of, say, a typical human. So if you see someone looming large in your vision, you can reckon they're nearby, whereas if they appear very small, they must be much farther away.