Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 1 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/18/2020   10:42:24   (   0.03,-137.21) (   0.20,-137.94)   82.43                80
 01/19/2020   10:20:48   (   0.03,-137.21) (  -0.83,-133.36)  438.95                80
 01/20/2020   22:45:08   (  -0.04,-137.21) (  -0.37,-138.59)  157.54                80
 01/21/2020   22:23:32   (  -0.04,-137.21) (   0.67,-134.02)  363.54                80
 01/23/2020   10:47:42   (   0.05,-137.19) (   0.51,-139.21)  230.18                80
 01/24/2020   10:26:07   (   0.05,-137.19) (  -0.52,-134.64)  290.53                80
 01/25/2020   22:50:26   (  -0.06,-137.18) (  -0.68,-139.87)  306.94                80
 01/26/2020   22:28:51   (  -0.05,-137.17) (   0.35,-135.29)  213.66                80
 01/28/2020   10:53:01   (   0.06,-137.15) (   0.82,-140.49)  380.51                80
 01/29/2020   10:31:26   (   0.06,-137.14) (  -0.21,-135.91)  139.76                80
 01/30/2020   22:55:45   (  -0.07,-137.12) (  -0.99,-141.14)  458.53                80
 01/31/2020   22:34:09   (  -0.06,-137.11) (   0.04,-136.57)   61.53                80