When updating the TLE epoch, the revolution number does not change

[david-macmahon]

Not sure whether the revolution_number is supposed to change with an epoch change, but it seems like it probably should account for the revolutions that occur between the original epoch and the new epoch (assuming it's more than a partial revolution).

[ronisbr]

Hi @david-macmahon !

Nice suggestion! I will try to develop something that can be used or not depending on a keyword.

[ronisbr]

Hi @david-macmahon

I have one question, should we assume that the revolution starts at the current epoch or when the satellite crosses the argument of perigee? I have no idea what is the best approach here.

[david-macmahon]

I don't know when a satellite's "revolution counter" starts, but I assume it is independent from the epoch of the TLE (which I assume is baed on whenever the observations from which the TLE was derived happened rather than anything inherent to the orbital parameters). I guess one could determine the reference point of the revolution counter by comparing the values from different epoch across multiple satellites. Maybe it counts how many times it has passed the ascending node???