Today I released the first open source version of swift-sgp4, a very simple Swift Package that calculates the position of a satellite given a two-line elements set (TLE).
The library wouldn’t have been possible without the fundamental help of sgp4, a satellite prediction C++ library developed by Daniel Warner.
As you may imagine, swift-sgp4 is the core of [ISSSeeker]({{ site.url }}/apps/issseeker).