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   22:30:22   (   0.03,-137.20) (   0.77,-133.94)  372.34                80
 05/01/2021   10:54:30   (  -0.02,-137.19) (   0.39,-139.12)  218.54                80
 05/02/2021   10:32:53   (  -0.02,-137.19) (  -0.64,-134.53)  304.00                80
 05/03/2021   22:54:28   (   0.01,-137.19) (  -0.57,-139.73)  290.09                80
 05/04/2021   22:38:11   (   0.01,-137.18) (   0.46,-135.14)  232.51                80
 05/06/2021   10:59:39   (  -0.01,-137.18) (   0.70,-140.32)  358.63                80
 05/07/2021   10:38:01   (  -0.01,-137.17) (  -0.33,-135.73)  163.69                80
 05/08/2021   22:59:38   (   0.01,-137.16) (  -0.82,-140.95)  431.08                80
 05/09/2021   22:43:20   (   0.01,-137.15) (   0.22,-136.36)   91.11                80
 05/12/2021   10:43:10   (  -0.01,-137.13) (  -0.03,-136.94)   20.85                80