* First Python-3 only release!
* Deprecated HighAccuracyTLEPredictor class, removed non-precise algorithm
* Added new Keplerian and J2 predictors based on classical orbital elements
* Added functions to create sun-synchronous satellites and planar constellations
* Added new NoradTLESource
* Fix off-nadir angle calculation
* Allow custom locations using an environment variable
* Do not round the microseconds internally, achieve much higher precision
(validated against STK)