Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/29/2021   22:33:02   (   0.03,-137.19) (   0.79,-133.94)  371.62                80
 05/01/2021   10:54:30   (  -0.02,-137.18) (   0.43,-139.11)  220.20                80
 05/02/2021   10:32:52   (  -0.02,-137.17) (  -0.60,-134.52)  301.79                80
 05/03/2021   22:54:28   (   0.01,-137.16) (  -0.55,-139.73)  293.15                80
 05/04/2021   22:38:11   (   0.01,-137.15) (   0.48,-135.15)  228.87                80
 05/06/2021   10:59:39   (  -0.01,-137.13) (   0.68,-140.33)  363.18                80
 05/07/2021   10:38:02   (  -0.01,-137.12) (  -0.35,-135.74)  158.61                80
 05/08/2021   22:59:37   (   0.01,-137.11) (  -0.85,-140.94)  437.04                80
 05/09/2021   22:43:20   (   0.01,-137.09) (   0.18,-136.35)   84.53                80
 05/12/2021   10:43:10   (  -0.01,-137.05) (  -0.06,-136.95)   12.96                80