Hello,Aspirant

Systems Tool Kit (formerly Satellite Tool Kit ), often referred to by its initials STK , is a physics-based software package from Analytical Graphics, Inc. that allows engineers and scientists to perform complex analyses of ground, sea, air, and space platforms, and share results in one integrated environment [1] . At the core of STK is a geometry engine for determining the time-dynamic position and attitude of objects ("assets"), and the spatial relationships among the objects under consideration including their relationships or accesses given a number of complex, simultaneous constraining conditions. STK has been developed since 1989 as a commercial off the shelf software tool. Originally created [2] to solve problems involving Earth-orbiting satellites , it is now used in the aerospace and defense communities and for many other applications.

For more details kindly visit the link provided below:

https://en.wikipedia.org/wiki/Systems_Tool_Kit

Hope this helps.