Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/03/2021   22:57:08   (   0.02,-137.20) (  -0.56,-139.73)  288.70                80
 05/04/2021   22:35:31   (   0.02,-137.20) (   0.47,-135.14)  234.48                80
 05/06/2021   10:59:39   (  -0.01,-137.20) (   0.69,-140.32)  355.85                80
 05/07/2021   10:38:02   (  -0.01,-137.20) (  -0.34,-135.73)  167.08                80
 05/08/2021   22:59:38   (   0.01,-137.20) (  -0.81,-140.95)  426.52                80
 05/09/2021   22:40:40   (   0.01,-137.20) (   0.22,-136.36)   96.25                80
 05/11/2021   11:04:48   (  -0.01,-137.19) (   0.99,-141.53)  494.87                80
 05/12/2021   10:43:10   (  -0.01,-137.19) (  -0.04,-136.94)   27.43                80
 05/14/2021   22:45:49   (   0.01,-137.16) (  -0.08,-137.57)   46.11                80
 05/15/2021   22:29:32   (   0.01,-137.15) (   0.95,-132.98)  475.50                80