This post discusses building a real-time streaming pipeline using Apache Spark to track satellites using Two-Line Element (TLE) data.The TLE API, provided by CelesTrak, is a public API that hosts data for the space community.The post explains the TLE format, which consists of two lines of data encoding orbital elements for calculating a satellite's position and velocity.The TLE format was developed by the US Air Force and adopted by NORAD to track objects in space.