Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2019   10:32:03   (   0.02,-137.20) (  -0.23,-136.11)  124.66                80
 12/24/2019   22:56:22   (  -0.03,-137.19) (  -0.93,-141.35)  472.62                80
 12/25/2019   22:34:47   (  -0.03,-137.19) (   0.09,-136.77)   47.87                80
 12/28/2019   10:40:01   (   0.03,-137.16) (   0.11,-137.38)   27.02                80
 12/29/2019   10:18:26   (   0.02,-137.14) (  -0.92,-132.81)  493.19                80
 12/30/2019   22:42:45   (  -0.03,-137.12) (  -0.25,-138.04)  105.08                80
 12/31/2019   22:21:10   (  -0.02,-137.11) (   0.78,-133.47)  414.77                80
 01/02/2020   10:45:21   (   0.03,-137.09) (   0.38,-138.67)  180.58                80
 01/03/2020   10:23:46   (   0.02,-137.07) (  -0.65,-134.10)  338.97                80
 01/04/2020   22:48:04   (  -0.04,-137.04) (  -0.58,-139.32)  260.17                80
 01/05/2020   22:26:28   (  -0.03,-137.02) (   0.45,-134.74)  259.05                80