Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/13/2021   22:52:45   (   0.03,-137.22) (  -0.58,-139.80)  294.35                80
 02/14/2021   22:36:29   (   0.03,-137.22) (   0.49,-135.22)  228.29                80
 02/16/2021   10:57:56   (  -0.02,-137.22) (   0.71,-140.39)  362.83                80
 02/17/2021   10:36:20   (  -0.02,-137.21) (  -0.36,-135.82)  159.40                80
 02/18/2021   22:57:57   (   0.02,-137.21) (  -0.83,-141.03)  435.95                80
 02/19/2021   22:41:39   (   0.02,-137.20) (   0.18,-136.44)   85.92                80
 02/22/2021   10:41:30   (   0.00,-137.17) (  -0.05,-137.04)   15.29                80
 02/24/2021   22:44:10   (  -0.01,-137.13) (  -0.12,-137.66)   61.00                80
 02/25/2021   22:27:53   (  -0.00,-137.11) (   0.89,-133.07)  459.68                80