Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/27/2021   10:27:44   (  -0.03,-137.20) (  -0.91,-133.32)  443.22                80
 04/28/2021   22:51:59   (   0.02,-137.20) (  -0.29,-138.52)  150.69                80
 04/29/2021   22:33:01   (   0.03,-137.20) (   0.74,-133.93)  371.86                80
 05/01/2021   10:54:30   (  -0.02,-137.19) (   0.43,-139.11)  219.51                80
 05/02/2021   10:32:52   (  -0.02,-137.18) (  -0.60,-134.52)  302.59                80
 05/03/2021   22:54:28   (   0.01,-137.17) (  -0.54,-139.74)  292.51                80
 05/04/2021   22:38:11   (   0.01,-137.16) (   0.49,-135.15)  229.63                80
 05/06/2021   10:59:38   (  -0.01,-137.15) (   0.73,-140.31)  362.02                80
 05/07/2021   10:38:01   (  -0.01,-137.14) (  -0.30,-135.73)  159.88                80
 05/08/2021   22:59:37   (   0.01,-137.12) (  -0.84,-140.94)  435.89                80
 05/09/2021   22:43:20   (   0.01,-137.11) (   0.19,-136.36)   85.80                80