Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/11/2021   11:04:48   (  -0.01,-137.19) (   0.95,-141.53)  494.22                80
 05/12/2021   10:43:10   (  -0.02,-137.19) (  -0.08,-136.95)   28.21                80
 05/14/2021   22:48:28   (   0.01,-137.17) (  -0.10,-137.56)   44.77                80
 05/15/2021   22:26:51   (   0.01,-137.16) (   0.94,-132.97)  477.10                80
 05/17/2021   10:50:59   (  -0.01,-137.14) (   0.20,-138.16)  115.20                80
 05/18/2021   10:29:21   (  -0.01,-137.13) (  -0.78,-133.56)  406.23                80
 05/19/2021   22:50:57   (   0.01,-137.10) (  -0.37,-138.77)  190.24                80
 05/20/2021   22:34:39   (   0.01,-137.08) (   0.66,-134.18)  330.92                80
 05/22/2021   10:56:07   (  -0.00,-137.05) (   0.52,-139.35)  262.27                80
 05/23/2021   10:34:29   (  -0.00,-137.03) (  -0.52,-134.77)  258.46                80
 05/24/2021   22:56:06   (   0.00,-137.00) (  -0.64,-139.98)  339.38                80