Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/08/2021   10:30:57   (   0.00,-137.19) (  -0.73,-133.80)  386.76                80
 06/09/2021   22:55:14   (  -0.00,-137.20) (  -0.39,-139.02)  206.86                80
 06/10/2021   22:33:37   (   0.00,-137.20) (   0.65,-134.43)  316.38                80
 06/12/2021   10:57:43   (  -0.00,-137.20) (   0.56,-139.59)  273.00                80
 06/13/2021   10:36:06   (  -0.01,-137.20) (  -0.49,-135.01)  249.81                80
 06/14/2021   23:00:22   (   0.00,-137.19) (  -0.70,-140.22)  345.18                80
 06/15/2021   22:38:44   (   0.01,-137.19) (   0.35,-135.63)  177.39                80
 06/17/2021   11:02:52   (  -0.00,-137.18) (   0.80,-140.81)  412.89                80
 06/18/2021   10:41:14   (  -0.00,-137.18) (  -0.25,-136.22)  109.40                80
 06/19/2021   23:05:31   (   0.00,-137.16) (  -0.94,-141.43)  486.65                80
 06/20/2021   22:46:32   (   0.00,-137.15) (   0.05,-136.83)   35.22                80