Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/23/2021   22:44:10   (   0.02,-137.20) (   0.03,-137.31)   12.48                80
 04/26/2021   10:49:21   (  -0.02,-137.20) (   0.11,-137.90)   80.04                80
 04/27/2021   10:27:44   (  -0.02,-137.19) (  -0.92,-133.32)  442.18                80
 04/28/2021   22:51:59   (   0.02,-137.18) (  -0.29,-138.52)  153.35                80
 04/29/2021   22:33:02   (   0.02,-137.16) (   0.74,-133.93)  368.40                80
 05/01/2021   10:54:30   (  -0.02,-137.15) (   0.42,-139.11)  223.74                80
 05/02/2021   10:32:52   (  -0.02,-137.13) (  -0.61,-134.52)  297.61                80
 05/03/2021   22:54:28   (   0.01,-137.11) (  -0.59,-139.73)  299.06                80
 05/04/2021   22:38:10   (   0.01,-137.09) (   0.44,-135.14)  222.28                80
 05/06/2021   10:59:38   (  -0.01,-137.07) (   0.73,-140.32)  370.20                80