Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/18/2021   10:41:14   (   0.02,-137.20) (  -0.21,-136.21)  112.70                80
 06/19/2021   23:05:30   (  -0.02,-137.19) (  -0.98,-141.42)  482.64                80
 06/20/2021   22:43:52   (  -0.02,-137.18) (   0.07,-136.83)   39.59                80
 06/23/2021   10:49:01   (   0.01,-137.16) (   0.08,-137.41)   29.63                80
 06/24/2021   10:27:24   (  -0.00,-137.14) (  -0.96,-132.83)  491.80                80
 06/25/2021   22:51:40   (   0.00,-137.11) (  -0.22,-138.04)  105.57                80
 06/26/2021   22:32:43   (   0.01,-137.10) (   0.82,-133.45)  415.70                80
 06/28/2021   10:54:10   (  -0.01,-137.08) (   0.31,-138.63)  176.15                80
 06/29/2021   10:32:31   (  -0.01,-137.06) (  -0.67,-134.03)  345.11                80
 06/30/2021   22:54:08   (   0.01,-137.03) (  -0.51,-139.24)  252.43                80
 07/01/2021   22:37:50   (   0.01,-137.01) (   0.54,-134.65)  268.72                80