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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2019   10:42:59   (   0.00,-137.20) (   0.19,-138.13)  104.99                80
 12/13/2019   10:21:24   (  -0.00,-137.18) (  -0.83,-133.55)  413.95                80
 12/14/2019   22:45:42   (  -0.00,-137.13) (  -0.39,-138.77)  187.36                80
 12/15/2019   22:24:07   (   0.01,-137.11) (   0.64,-134.20)  331.03                80
 12/17/2019   10:48:18   (  -0.00,-137.07) (   0.55,-139.40)  265.94                80
 12/18/2019   10:26:42   (  -0.01,-137.04) (  -0.48,-134.82)  252.20                80
 12/19/2019   22:51:02   (   0.00,-136.99) (  -0.68,-140.06)  349.96                80
 12/20/2019   22:29:26   (   0.01,-136.96) (   0.34,-135.48)  167.95                80
 12/22/2019   10:53:38   (   0.00,-136.91) (   0.84,-140.68)  429.63                80
 12/23/2019   10:32:02   (  -0.00,-136.88) (  -0.19,-136.11)   87.95                80
 12/25/2019   22:34:45   (  -0.01,-136.77) (  -0.00,-136.76)    1.95                80