Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 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)
 09/22/2020   10:41:51   (   0.04,-137.21) (   0.16,-137.84)   71.12                80
 09/23/2020   10:25:35   (   0.04,-137.21) (  -0.86,-133.26)  451.28                80
 09/24/2020   22:44:33   (  -0.04,-137.20) (  -0.31,-138.48)  145.32                80
 09/25/2020   22:28:17   (  -0.03,-137.20) (   0.71,-133.90)  376.68                80
 09/27/2020   10:47:06   (   0.02,-137.21) (   0.45,-139.09)  214.35                80
 09/28/2020   10:30:49   (   0.02,-137.21) (  -0.57,-134.51)  307.54                80
 09/29/2020   22:49:48   (  -0.02,-137.20) (  -0.60,-139.73)  289.55                80
 09/30/2020   22:33:31   (  -0.02,-137.19) (   0.42,-135.15)  232.28                80
 10/02/2020   10:52:21   (   0.01,-137.19) (   0.74,-140.34)  359.08                80
 10/03/2020   10:36:04   (   0.02,-137.19) (  -0.29,-135.76)  162.49                80
 10/04/2020   22:55:02   (  -0.02,-137.17) (  -0.89,-140.98)  435.41                80