Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2021   23:04:45   (   0.02,-137.20) (  -0.71,-140.54)  380.30                80
 12/17/2021   22:49:02   (   0.01,-137.20) (   0.29,-136.10)  126.33                80
 12/19/2021   11:08:42   (  -0.01,-137.19) (   0.97,-141.48)  488.62                80
 12/20/2021   10:53:00   (  -0.00,-137.18) (  -0.03,-137.03)   17.39                80
 12/22/2021   22:54:28   (  -0.00,-137.15) (  -0.22,-138.01)   98.56                80
 12/23/2021   22:38:45   (  -0.00,-137.14) (   0.78,-133.56)  407.02                80
 12/25/2021   10:58:27   (   0.00,-137.12) (   0.43,-138.95)  209.27                80
 12/26/2021   10:42:44   (   0.00,-137.11) (  -0.57,-134.51)  295.87                80
 12/27/2021   23:02:34   (   0.00,-137.07) (  -0.66,-139.94)  326.88                80
 12/28/2021   22:46:52   (  -0.00,-137.05) (   0.34,-135.49)  177.97                80