Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 27.  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)   78.92                80
 12/29/2020   22:27:37   (   0.00,-137.22) (   0.87,-133.33)  443.52                80
 12/31/2020   10:46:26   (   0.00,-137.22) (   0.28,-138.52)  147.78                80
 01/01/2021   10:30:09   (   0.01,-137.21) (  -0.71,-133.93)  374.06                80
 01/02/2021   22:49:06   (  -0.01,-137.19) (  -0.43,-139.15)  222.69                80
 01/03/2021   22:32:48   (  -0.01,-137.18) (   0.56,-134.56)  298.77                80
 01/05/2021   10:51:38   (  -0.00,-137.17) (   0.59,-139.74)  293.71                80
 01/06/2021   10:35:21   (  -0.00,-137.16) (  -0.47,-135.17)  227.44                80
 01/07/2021   22:54:18   (  -0.00,-137.13) (  -0.73,-140.38)  370.37                80
 01/08/2021   22:38:00   (  -0.01,-137.11) (   0.27,-135.78)  150.44                80