Observers residing above approximately what North latitude may never see Tiangong ascend high enough above the horizon?
Answer
60 degrees North latitude
Due to Tiangong's orbital inclination of 41 to 43 degrees, which results in its path flying quite far to the south relative to the ISS, there is a distinct upper limit for visibility in the Northern Hemisphere. Observers situated above approximately 60 degrees North latitude will find that the station simply does not ascend high enough above their horizon to be considered a viable target for observation. This range includes locations such as the northern reaches of Canada, much of Alaska, Norway, Sweden, and Finland.
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