Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2021   10:54:29   (  -0.02,-137.19) (   0.44,-139.11)  218.70                80
 05/02/2021   10:32:52   (  -0.02,-137.19) (  -0.60,-134.52)  303.80                80
 05/03/2021   22:54:28   (   0.02,-137.19) (  -0.56,-139.73)  290.18                80
 05/04/2021   22:38:11   (   0.02,-137.18) (   0.47,-135.14)  232.33                80
 05/06/2021   10:59:39   (  -0.01,-137.17) (   0.69,-140.32)  359.04                80
 05/07/2021   10:38:02   (  -0.01,-137.17) (  -0.35,-135.74)  163.21                80
 05/08/2021   22:59:37   (   0.01,-137.16) (  -0.86,-140.94)  431.46                80
 05/09/2021   22:43:20   (   0.01,-137.15) (   0.17,-136.35)   90.65                80
 05/12/2021   10:43:10   (  -0.01,-137.12) (  -0.05,-136.94)   19.99                80
 05/14/2021   22:45:49   (   0.01,-137.08) (  -0.07,-137.57)   55.24                80