Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/09/2021   22:55:14   (  -0.01,-137.20) (  -0.44,-139.01)  206.97                80
 06/10/2021   22:33:36   (   0.00,-137.20) (   0.61,-134.42)  316.21                80
 06/12/2021   10:57:43   (  -0.00,-137.20) (   0.54,-139.60)  273.20                80
 06/13/2021   10:36:06   (  -0.00,-137.20) (  -0.50,-135.01)  249.55                80
 06/14/2021   23:00:22   (   0.00,-137.19) (  -0.69,-140.22)  345.55                80
 06/15/2021   22:38:45   (   0.00,-137.19) (   0.36,-135.63)  176.95                80
 06/17/2021   11:02:52   (  -0.00,-137.18) (   0.79,-140.81)  413.38                80
 06/18/2021   10:41:14   (  -0.00,-137.17) (  -0.20,-136.21)  108.85                80
 06/19/2021   23:05:30   (   0.00,-137.15) (  -0.99,-141.42)  487.31                80
 06/20/2021   22:46:32   (   0.00,-137.14) (   0.06,-136.83)   34.44                80