Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 1 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/15/2020   22:37:09   (  -0.04,-137.22) (  -0.04,-137.32)   11.70                80
 01/18/2020   10:42:24   (   0.04,-137.21) (   0.20,-137.94)   82.63                80
 01/19/2020   10:20:48   (   0.04,-137.21) (  -0.83,-133.36)  438.52                80
 01/20/2020   22:45:08   (  -0.05,-137.20) (  -0.37,-138.59)  158.50                80
 01/21/2020   22:23:32   (  -0.05,-137.20) (   0.66,-134.02)  362.36                80
 01/23/2020   10:47:43   (   0.06,-137.19) (   0.53,-139.21)  231.38                80
 01/24/2020   10:26:07   (   0.05,-137.18) (  -0.50,-134.64)  289.10                80
 01/25/2020   22:50:27   (  -0.06,-137.16) (  -0.64,-139.88)  308.95                80
 01/26/2020   22:28:51   (  -0.06,-137.15) (   0.33,-135.29)  211.45                80
 01/28/2020   10:53:02   (   0.07,-137.13) (   0.80,-140.50)  382.77                80
 01/29/2020   10:31:27   (   0.06,-137.12) (  -0.23,-135.92)  137.30                80