Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2020   22:42:01   (   0.01,-137.22) (  -0.07,-137.57)   39.87                80
 12/08/2020   22:25:45   (   0.01,-137.21) (   0.98,-132.99)  482.37                80
 12/10/2020   10:44:34   (  -0.01,-137.21) (   0.19,-138.17)  109.59                80
 12/11/2020   10:28:16   (  -0.00,-137.20) (  -0.80,-133.58)  412.23                80
 12/12/2020   22:47:14   (   0.00,-137.18) (  -0.35,-138.80)  184.21                80
 12/13/2020   22:30:56   (  -0.00,-137.17) (   0.64,-134.21)  337.17                80
 12/15/2020   10:49:46   (   0.01,-137.15) (   0.53,-139.40)  256.08                80
 12/16/2020   10:30:49   (   0.01,-137.14) (  -0.52,-134.82)  264.79                80
 12/17/2020   22:52:25   (  -0.01,-137.11) (  -0.69,-140.03)  332.91                80
 12/18/2020   22:36:09   (  -0.01,-137.09) (   0.36,-135.45)  187.84                80
 12/20/2020   10:57:38   (   0.01,-137.07) (   0.81,-140.63)  405.88                80