Let's trace how a weather update happens using a Polar satellite. Step 1: The satellite is launched into a low orbit (approx. 700 km). Step 2: Because it is close to Earth, it moves very fast, completing a circle in about 98 minutes. Step 3: As the satellite moves from North to South, the Earth rotates slightly from West to East underneath it. Step 4: By the time the satellite finishes one orbit, it is now over a different part of the world. Step 5: After about 14 orbits in one day, the satellite has scanned the entire surface of the planet, giving us a full picture of the world's weather.