Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 1 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/13/2020   10:34:24   (   0.03,-137.21) (  -0.09,-136.66)   63.14                80
 01/15/2020   22:39:48   (  -0.04,-137.21) (  -0.07,-137.31)   12.46                80
 01/18/2020   10:42:24   (   0.04,-137.21) (   0.18,-137.95)   83.43                80
 01/19/2020   10:20:48   (   0.04,-137.20) (  -0.80,-133.36)  437.53                80
 01/20/2020   22:42:28   (  -0.05,-137.18) (  -0.34,-138.60)  160.74                80
 01/21/2020   22:23:32   (  -0.05,-137.18) (   0.63,-134.01)  359.92                80
 01/23/2020   10:47:43   (   0.06,-137.17) (   0.49,-139.22)  233.36                80
 01/24/2020   10:26:06   (   0.06,-137.16) (  -0.48,-134.63)  286.89                80
 01/25/2020   22:50:27   (  -0.06,-137.13) (  -0.66,-139.87)  312.41                80
 01/26/2020   22:28:51   (  -0.06,-137.12) (   0.37,-135.30)  207.74                80