#satellites

Why is it difficult to get an accurate figure regarding the number of satellites launched? I can understand why tracking agencies might disagree over the number of satellites in orbit but I don't really get why there's variation in the reporting of how many satellites have been launched. Are...

Hi. I want to create a list of a number of custom satellites and track them simultaneously as a list to get prediction of their passes easily rather than checking each satellite separately, Do you know any websites or an android/PC Apps to do this?