Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/29/2021   10:32:32   (   0.02,-137.19) (  -0.71,-134.03)  360.44                80
 06/30/2021   22:56:48   (  -0.03,-137.19) (  -0.48,-139.24)  234.11                80
 07/01/2021   22:35:11   (  -0.03,-137.18) (   0.57,-134.66)  288.66                80
 07/03/2021   10:59:17   (   0.03,-137.18) (   0.62,-139.82)  301.53                80
 07/04/2021   10:37:40   (   0.02,-137.17) (  -0.42,-135.24)  220.69                80
 07/05/2021   22:59:16   (  -0.01,-137.15) (  -0.76,-140.45)  375.23                80
 07/06/2021   22:42:58   (  -0.01,-137.14) (   0.29,-135.86)  146.53                80
 07/08/2021   11:04:26   (  -0.00,-137.13) (   0.85,-141.04)  445.23                80
 07/09/2021   10:42:47   (  -0.01,-137.11) (  -0.14,-136.44)   76.02                80
 07/11/2021   22:45:26   (   0.01,-137.06) (   0.02,-137.07)    0.79                80