Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2019   10:53:39   (   0.02,-137.21) (   0.77,-140.69)  396.14                80
 12/23/2019   10:32:02   (   0.02,-137.21) (  -0.20,-136.10)  124.77                80
 12/24/2019   22:56:21   (  -0.03,-137.20) (  -0.97,-141.34)  472.59                80
 12/25/2019   22:34:46   (  -0.02,-137.19) (   0.06,-136.76)   47.88                80
 12/28/2019   10:40:02   (   0.03,-137.16) (   0.08,-137.39)   26.55                80
 12/29/2019   10:18:26   (   0.02,-137.15) (  -0.95,-132.82)  493.47                80
 12/30/2019   22:42:46   (  -0.03,-137.13) (  -0.21,-138.05)  104.83                80
 12/31/2019   22:21:10   (  -0.02,-137.11) (   0.82,-133.48)  415.08                80
 01/02/2020   10:45:20   (   0.03,-137.09) (   0.40,-138.67)  180.13                80
 01/03/2020   10:23:45   (   0.02,-137.07) (  -0.63,-134.09)  339.48                80
 01/04/2020   22:48:04   (  -0.03,-137.05) (  -0.54,-139.33)  259.68                80