Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2020   22:55:45   (  -0.00,-137.23) (  -0.83,-140.91)  419.97                80
 12/02/2020   22:39:28   (  -0.00,-137.22) (   0.21,-136.33)  101.85                80
 12/04/2020   10:58:18   (   0.00,-137.21) (   0.95,-141.52)  490.41                80
 12/05/2020   10:39:20   (   0.01,-137.20) (  -0.03,-136.92)   30.93                80
 12/07/2020   22:42:01   (  -0.00,-137.16) (  -0.08,-137.57)   45.86                80
 12/08/2020   22:25:43   (  -0.00,-137.15) (   0.91,-132.97)  475.05                80
 12/10/2020   10:44:33   (   0.00,-137.13) (   0.26,-138.16)  118.44                80
 12/11/2020   10:28:16   (   0.00,-137.11) (  -0.79,-133.58)  402.01                80
 12/12/2020   22:47:13   (  -0.00,-137.07) (  -0.42,-138.79)  197.00                80
 12/13/2020   22:30:56   (  -0.01,-137.05) (   0.63,-134.21)  322.97                80