Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/10/2021   22:33:36   (  -0.00,-137.20) (   0.63,-134.43)  316.28                80
 06/12/2021   10:57:44   (   0.01,-137.20) (   0.52,-139.60)  273.21                80
 06/13/2021   10:36:05   (  -0.00,-137.20) (  -0.46,-135.00)  249.50                80
 06/14/2021   23:00:22   (  -0.00,-137.19) (  -0.66,-140.22)  345.61                80
 06/15/2021   22:38:44   (  -0.00,-137.18) (   0.32,-135.63)  176.85                80
 06/17/2021   11:02:51   (   0.01,-137.18) (   0.82,-140.80)  413.58                80
 06/18/2021   10:41:14   (   0.00,-137.17) (  -0.22,-136.22)  108.54                80
 06/19/2021   23:05:30   (  -0.01,-137.15) (  -0.96,-141.43)  487.59                80
 06/20/2021   22:43:53   (  -0.00,-137.13) (   0.08,-136.84)   34.06                80
 06/23/2021   10:49:02   (  -0.01,-137.10) (   0.08,-137.42)   36.99                80