Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 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)
 09/23/2020   10:25:34   (   0.05,-137.21) (  -0.82,-133.25)  451.67                80
 09/24/2020   22:44:33   (  -0.04,-137.20) (  -0.30,-138.48)  145.19                80
 09/25/2020   22:28:17   (  -0.04,-137.20) (   0.72,-133.90)  376.84                80
 09/27/2020   10:47:06   (   0.03,-137.21) (   0.45,-139.09)  214.01                80
 09/28/2020   10:30:50   (   0.03,-137.21) (  -0.58,-134.51)  307.87                80
 09/29/2020   22:49:48   (  -0.02,-137.20) (  -0.60,-139.73)  289.47                80
 09/30/2020   22:33:31   (  -0.02,-137.19) (   0.42,-135.15)  232.34                80
 10/02/2020   10:52:21   (   0.02,-137.19) (   0.74,-140.34)  358.85                80
 10/03/2020   10:36:04   (   0.02,-137.19) (  -0.28,-135.76)  162.69                80
 10/04/2020   22:55:03   (  -0.02,-137.17) (  -0.90,-140.98)  435.51                80
 10/05/2020   22:38:46   (  -0.02,-137.16) (   0.12,-136.40)   85.57                80