Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2020   10:49:46   (  -0.01,-137.22) (   0.46,-139.41)  248.97                80
 12/16/2020   10:33:29   (  -0.00,-137.21) (  -0.54,-134.82)  273.00                80
 12/17/2020   22:52:26   (   0.00,-137.20) (  -0.61,-140.04)  323.08                80
 12/18/2020   22:36:09   (   0.00,-137.19) (   0.39,-135.45)  198.71                80
 12/20/2020   10:54:58   (  -0.00,-137.18) (   0.78,-140.63)  393.61                80
 12/21/2020   10:38:42   (  -0.00,-137.17) (  -0.28,-136.06)  128.04                80
 12/22/2020   22:57:38   (   0.00,-137.16) (  -0.91,-141.27)  468.46                80
 12/23/2020   22:41:20   (   0.00,-137.14) (   0.08,-136.68)   53.02                80
 12/26/2020   10:41:13   (   0.00,-137.11) (   0.02,-137.28)   19.16                80