Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2020   22:41:21   (   0.02,-137.21) (   0.11,-136.68)   60.22                80
 12/26/2020   10:41:14   (  -0.01,-137.20) (  -0.00,-137.29)    9.66                80
 12/28/2020   22:43:54   (  -0.00,-137.16) (  -0.15,-137.92)   85.50                80
 12/29/2020   22:27:37   (  -0.01,-137.15) (   0.85,-133.33)  435.53                80
 12/31/2020   10:46:26   (   0.01,-137.13) (   0.31,-138.51)  157.75                80
 01/01/2021   10:30:08   (   0.01,-137.11) (  -0.68,-133.92)  362.65                80
 01/02/2021   22:49:06   (  -0.01,-137.07) (  -0.46,-139.14)  236.36                80
 01/03/2021   22:32:48   (  -0.01,-137.04) (   0.54,-134.55)  283.76                80
 01/05/2021   10:51:38   (   0.01,-137.02) (   0.62,-139.74)  310.50                80