Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/04/2020   10:58:17   (  -0.01,-137.22) (   0.98,-141.51)  489.93                80
 12/05/2020   10:42:01   (  -0.00,-137.21) (  -0.07,-136.93)   31.59                80
 12/07/2020   22:42:00   (   0.00,-137.18) (  -0.10,-137.56)   44.03                80
 12/08/2020   22:25:44   (   0.00,-137.17) (   0.95,-132.98)  477.20                80
 12/10/2020   10:44:33   (  -0.00,-137.15) (   0.22,-138.17)  116.15                80
 12/11/2020   10:28:17   (  -0.00,-137.13) (  -0.83,-133.59)  404.60                80
 12/12/2020   22:47:13   (  -0.00,-137.10) (  -0.38,-138.80)  193.58                80
 12/13/2020   22:30:56   (  -0.01,-137.08) (   0.61,-134.21)  326.74                80
 12/15/2020   10:52:25   (   0.01,-137.05) (   0.56,-139.39)  267.97                80
 12/16/2020   10:30:48   (   0.01,-137.02) (  -0.49,-134.81)  251.79                80