Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2019   22:18:15   (   0.02,-128.11) (  -0.96,-132.49)  498.84                80
 12/11/2019   22:01:59   (   0.01,-128.08) (   0.06,-127.92)   19.72                80
 12/14/2019   10:01:55   (  -0.01,-128.03) (   0.10,-128.54)   57.77                80
 12/15/2019   09:45:40   (   0.00,-128.00) (  -0.92,-123.96)  459.94                80
 12/16/2019   22:04:38   (   0.02,-127.91) (  -0.29,-129.19)  146.72                80
 12/17/2019   21:48:22   (   0.01,-127.87) (   0.73,-124.61)  370.82                80
 12/19/2019   10:07:15   (  -0.03,-127.84) (   0.39,-129.82)  225.54                80
 12/20/2019   09:50:58   (  -0.02,-127.80) (  -0.57,-125.24)  291.83                80
 12/21/2019   22:09:57   (   0.03,-127.71) (  -0.58,-130.47)  315.36                80
 12/22/2019   21:53:42   (   0.02,-127.66) (   0.44,-125.90)  201.81                80