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  • $\begingroup$ Possible reasons for changing drag rate include: differing density of atmosphere ISS is passing through at different altitudes; differing latitudes meaning ISS meets different upper-atmosphere conditions (different densities, temperatures, effects of winds beneath, effects due to Earth (and therefore its atmosphere) not being spherical); and of course changes to ISS configuration and orientation will change how streamlined it is, not to mention that different payloads will change the ratio of its momentum to its drag profile, so it'll be more or less affected by the same magnitude of force. $\endgroup$ Commented Nov 9, 2015 at 16:41
  • $\begingroup$ You didn't include the biggest one of all, which is the solar cycle. The solar cycle results in the higher atmosphere being more active at it's peak, and less active in the solar minimums. $\endgroup$
    – PearsonArtPhoto
    Commented Nov 9, 2015 at 16:44