Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2020   10:41:51   (   0.04,-137.17) (   0.20,-137.83)   75.08                80
 09/23/2020   10:25:34   (   0.04,-137.16) (  -0.82,-133.25)  446.01                80
 09/24/2020   22:44:32   (  -0.04,-137.14) (  -0.35,-138.47)  152.11                80
 09/25/2020   22:28:16   (  -0.03,-137.13) (   0.68,-133.89)  368.65                80
 09/27/2020   10:47:05   (   0.02,-137.12) (   0.49,-139.08)  224.70                80
 09/28/2020   10:30:49   (   0.02,-137.10) (  -0.54,-134.50)  295.96                80
 09/29/2020   22:49:47   (  -0.02,-137.08) (  -0.64,-139.73)  302.72                80
 09/30/2020   22:33:31   (  -0.02,-137.06) (   0.39,-135.14)  217.89                80
 10/02/2020   10:52:20   (   0.01,-137.04) (   0.77,-140.33)  375.72                80
 10/03/2020   10:36:03   (   0.02,-137.02) (  -0.26,-135.75)  144.58                80