Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 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)
 12/28/2020   22:43:54   (   0.01,-137.22) (  -0.12,-137.92)   78.90                80
 12/29/2020   22:27:37   (   0.00,-137.22) (   0.88,-133.33)  443.57                80
 12/31/2020   10:46:26   (   0.00,-137.22) (   0.28,-138.52)  147.73                80
 01/01/2021   10:30:09   (   0.01,-137.21) (  -0.72,-133.93)  374.14                80
 01/02/2021   22:49:06   (  -0.00,-137.19) (  -0.43,-139.15)  222.61                80
 01/03/2021   22:32:49   (   0.00,-137.18) (   0.57,-134.56)  298.82                80
 01/05/2021   10:51:38   (  -0.01,-137.17) (   0.58,-139.75)  293.69                80
 01/06/2021   10:35:21   (  -0.01,-137.16) (  -0.48,-135.17)  227.50                80
 01/07/2021   22:54:18   (   0.00,-137.13) (  -0.72,-140.38)  370.21                80
 01/08/2021   22:38:00   (  -0.01,-137.11) (   0.28,-135.79)  150.70                80
 01/10/2021   10:56:49   (   0.01,-137.09) (   0.87,-140.97)  442.81                80