Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/26/2021   10:31:59   (   0.05,-137.21) (  -0.80,-133.48)  425.61                80
 08/27/2021   22:53:34   (  -0.05,-137.21) (  -0.36,-138.68)  167.93                80
 08/28/2021   22:37:16   (  -0.05,-137.20) (   0.64,-134.09)  355.15                80
 08/30/2021   10:58:44   (   0.04,-137.20) (   0.48,-139.27)  235.42                80
 08/31/2021   10:37:05   (   0.04,-137.19) (  -0.52,-134.67)  287.06                80
 09/01/2021   22:58:41   (  -0.03,-137.18) (  -0.64,-139.88)  308.15                80
 09/02/2021   22:42:22   (  -0.03,-137.17) (   0.37,-135.29)  213.88                80
 09/04/2021   11:01:11   (   0.01,-137.15) (   0.76,-140.47)  378.21                80
 09/05/2021   10:44:53   (   0.01,-137.14) (  -0.30,-135.89)  143.41                80
 09/06/2021   23:03:47   (  -0.00,-137.11) (  -0.91,-141.08)  452.96                80
 09/07/2021   22:47:30   (  -0.00,-137.10) (   0.15,-136.50)   68.61                80