Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/28/2021   10:38:55   (   0.03,-137.23) (  -0.70,-134.01)  366.25                80
 10/29/2021   22:57:50   (  -0.02,-137.22) (  -0.49,-139.21)  227.70                80
 10/30/2021   22:41:33   (  -0.02,-137.22) (   0.59,-134.63)  295.56                80
 11/01/2021   11:00:18   (   0.01,-137.21) (   0.61,-139.79)  294.23                80
 11/02/2021   10:43:59   (   0.01,-137.21) (  -0.42,-135.20)  228.67                80
 11/03/2021   23:02:56   (  -0.01,-137.19) (  -0.71,-140.41)  366.34                80
 11/04/2021   22:46:37   (  -0.02,-137.18) (   0.31,-135.82)  156.15                80
 11/06/2021   11:05:23   (   0.01,-137.16) (   0.89,-140.98)  435.05                80
 11/07/2021   10:49:04   (   0.01,-137.15) (  -0.14,-136.38)   86.68                80
 11/09/2021   22:51:41   (  -0.01,-137.09) (  -0.01,-136.99)   11.44                80