Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 1 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/21/2020   22:23:32   (  -0.04,-137.21) (   0.69,-134.02)  363.45                80
 01/23/2020   10:47:43   (   0.05,-137.19) (   0.48,-139.22)  230.86                80
 01/24/2020   10:26:06   (   0.05,-137.18) (  -0.49,-134.63)  289.75                80
 01/25/2020   22:50:27   (  -0.06,-137.17) (  -0.65,-139.87)  307.53                80
 01/26/2020   22:28:51   (  -0.06,-137.16) (   0.38,-135.30)  212.93                80
 01/28/2020   10:53:01   (   0.06,-137.14) (   0.79,-140.49)  381.85                80
 01/29/2020   10:31:25   (   0.06,-137.12) (  -0.19,-135.90)  138.33                80
 01/30/2020   22:55:45   (  -0.07,-137.11) (  -0.95,-141.15)  459.75                80
 01/31/2020   22:34:10   (  -0.06,-137.09) (   0.08,-136.57)   60.23                80
 02/03/2020   10:39:24   (   0.07,-137.04) (   0.11,-137.18)   16.18                80