Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2019   22:24:07   (  -0.00,-137.22) (   0.68,-134.21)  343.26                80
 12/17/2019   10:48:19   (   0.01,-137.22) (   0.50,-139.41)  249.42                80
 12/18/2019   10:26:43   (  -0.00,-137.22) (  -0.52,-134.83)  271.59                80
 12/19/2019   22:51:03   (  -0.00,-137.21) (  -0.64,-140.07)  325.86                80
 12/20/2019   22:29:27   (   0.00,-137.20) (   0.38,-135.49)  195.06                80
 12/22/2019   10:53:38   (   0.01,-137.20) (   0.80,-140.69)  398.12                80
 12/23/2019   10:32:03   (   0.01,-137.19) (  -0.23,-136.12)  122.35                80
 12/24/2019   22:56:22   (  -0.02,-137.17) (  -0.94,-141.35)  476.25                80
 12/25/2019   22:34:47   (  -0.01,-137.16) (   0.09,-136.78)   43.90                80
 12/28/2019   10:40:03   (   0.02,-137.13) (   0.07,-137.40)   30.61                80