Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2020   22:30:57   (   0.01,-137.22) (   0.70,-134.22)  342.90                80
 12/15/2020   10:49:46   (  -0.01,-137.22) (   0.47,-139.41)  248.79                80
 12/16/2020   10:33:29   (  -0.00,-137.21) (  -0.53,-134.81)  273.25                80
 12/17/2020   22:52:26   (   0.00,-137.20) (  -0.61,-140.04)  322.65                80
 12/18/2020   22:36:09   (  -0.00,-137.20) (   0.38,-135.45)  199.23                80
 12/20/2020   10:54:58   (  -0.00,-137.19) (   0.79,-140.63)  393.03                80
 12/21/2020   10:38:41   (  -0.00,-137.18) (  -0.27,-136.05)  128.69                80
 12/22/2020   22:57:38   (   0.00,-137.16) (  -0.93,-141.26)  467.64                80
 12/23/2020   22:41:21   (   0.00,-137.15) (   0.13,-136.69)   53.94                80
 12/26/2020   10:41:13   (   0.00,-137.12) (   0.04,-137.28)   17.97                80