Fig. 5From: Tiangong-1’s accelerated self-spin before reentryAll possible solutions determined from Fig. 2. a \(\theta _H\) versus \(\psi _H\). b The visible percentage of two CCRs during the observation time. The red region is the only correct solution which is determined by inspecting the visibility of the CCRs in the observation geometry, choosing similar values of \(\theta _H\) and L from adjacent passes and conforming the change in \(\psi _H\) to the lawBack to article page