Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 10 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)
 10/15/2019   10:40:59   (  -0.01,-137.20) (   0.07,-137.66)   51.71                80
 10/16/2019   10:22:04   (  -0.01,-137.20) (  -0.94,-133.09)  469.09                80
 10/17/2019   22:43:44   (  -0.00,-137.19) (  -0.24,-138.32)  129.02                80
 10/18/2019   22:22:09   (  -0.00,-137.18) (   0.77,-133.75)  391.23                80
 10/20/2019   10:46:20   (   0.00,-137.16) (   0.38,-138.95)  203.50                80
 10/21/2019   10:24:45   (   0.00,-137.15) (  -0.62,-134.38)  316.06                80
 10/22/2019   22:49:05   (  -0.00,-137.12) (  -0.55,-139.62)  284.05                80
 10/23/2019   22:27:29   (   0.00,-137.10) (   0.46,-135.04)  235.29                80
 10/25/2019   10:51:41   (   0.01,-137.08) (   0.69,-140.24)  360.34                80
 10/26/2019   10:30:05   (   0.01,-137.06) (  -0.32,-135.67)  158.82                80
 10/27/2019   22:54:24   (  -0.02,-137.02) (  -0.90,-140.90)  441.82                80