Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/07/2021   10:37:32   (   0.04,-137.22) (  -0.74,-133.85)  384.00                80
 10/08/2021   22:56:28   (  -0.04,-137.21) (  -0.45,-139.06)  210.40                80
 10/09/2021   22:40:09   (  -0.04,-137.20) (   0.57,-134.46)  312.37                80
 10/11/2021   10:58:55   (   0.03,-137.19) (   0.60,-139.63)  278.28                80
 10/12/2021   10:42:38   (   0.03,-137.18) (  -0.48,-135.05)  243.89                80
 10/13/2021   23:01:33   (  -0.02,-137.16) (  -0.71,-140.25)  352.28                80
 10/14/2021   22:45:15   (  -0.02,-137.14) (   0.31,-135.65)  169.65                80
 10/16/2021   11:04:01   (   0.01,-137.13) (   0.85,-140.82)  421.66                80
 10/17/2021   10:47:43   (   0.01,-137.11) (  -0.16,-136.23)  100.29                80
 10/18/2021   23:06:39   (  -0.01,-137.09) (  -0.96,-141.45)  496.04                80
 10/19/2021   22:50:20   (  -0.01,-137.07) (   0.06,-136.85)   25.86                80