Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2019   10:56:34   (   0.00,-137.20) (   0.95,-141.41)  479.66                80
 12/07/2019   10:34:59   (   0.00,-137.20) (  -0.07,-136.83)   41.40                80
 12/09/2019   22:40:23   (  -0.01,-137.18) (  -0.07,-137.50)   35.81                80
 12/10/2019   22:18:47   (  -0.01,-137.17) (   0.95,-132.92)  484.62                80
 12/12/2019   10:42:58   (   0.02,-137.16) (   0.24,-138.12)  109.55                80
 12/13/2019   10:21:23   (   0.01,-137.14) (  -0.79,-133.54)  410.16                80
 12/14/2019   22:45:42   (  -0.02,-137.11) (  -0.37,-138.78)  189.83                80
 12/15/2019   22:24:07   (  -0.01,-137.09) (   0.66,-134.21)  329.42                80
 12/17/2019   10:48:18   (   0.02,-137.07) (   0.53,-139.40)  266.16                80
 12/18/2019   10:26:43   (   0.01,-137.05) (  -0.50,-134.83)  252.75                80
 12/19/2019   22:51:01   (  -0.02,-137.00) (  -0.71,-140.05)  348.11                80