Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2019   22:45:42   (  -0.01,-137.22) (  -0.37,-138.78)  178.27                80
 12/15/2019   22:24:07   (  -0.00,-137.22) (   0.65,-134.20)  343.07                80
 12/17/2019   10:48:19   (   0.00,-137.22) (   0.48,-139.41)  249.59                80
 12/18/2019   10:26:44   (  -0.00,-137.22) (  -0.54,-134.84)  271.37                80
 12/19/2019   22:51:03   (  -0.00,-137.21) (  -0.62,-140.07)  326.30                80
 12/20/2019   22:29:28   (   0.00,-137.20) (   0.40,-135.50)  194.57                80
 12/22/2019   10:53:39   (   0.01,-137.20) (   0.78,-140.70)  398.57                80
 12/23/2019   10:32:03   (   0.00,-137.19) (  -0.24,-136.12)  121.84                80
 12/24/2019   22:56:23   (  -0.02,-137.16) (  -0.92,-141.36)  476.98                80
 12/25/2019   22:34:47   (  -0.01,-137.15) (   0.10,-136.78)   43.19                80