Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 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)
 05/14/2021   22:48:28   (   0.01,-137.20) (  -0.09,-137.56)   41.93                80
 05/15/2021   22:26:51   (   0.02,-137.20) (   0.95,-132.97)  481.17                80
 05/17/2021   10:50:59   (  -0.01,-137.20) (   0.18,-138.16)  108.64                80
 05/18/2021   10:29:22   (  -0.01,-137.19) (  -0.86,-133.57)  414.08                80
 05/19/2021   22:53:37   (   0.01,-137.18) (  -0.36,-138.77)  180.86                80
 05/20/2021   22:32:00   (   0.01,-137.18) (   0.68,-134.18)  341.57                80
 05/22/2021   10:56:07   (  -0.00,-137.17) (   0.49,-139.35)  249.12                80
 05/23/2021   10:34:29   (  -0.01,-137.16) (  -0.55,-134.77)  272.91                80
 05/24/2021   22:58:45   (   0.00,-137.14) (  -0.66,-139.97)  323.35                80
 05/25/2021   22:39:47   (   0.01,-137.12) (   0.39,-135.38)  198.18                80
 05/27/2021   11:01:15   (  -0.00,-137.10) (   0.78,-140.56)  394.04                80