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)
 06/19/2021   23:05:30   (  -0.02,-137.19) (  -0.96,-141.42)  482.60                80
 06/20/2021   22:43:53   (  -0.02,-137.18) (   0.08,-136.84)   39.75                80
 06/23/2021   10:49:02   (   0.01,-137.16) (   0.07,-137.42)   29.35                80
 06/24/2021   10:27:24   (  -0.00,-137.15) (  -0.98,-132.83)  492.04                80
 06/25/2021   22:51:40   (   0.00,-137.12) (  -0.21,-138.04)  105.30                80
 06/26/2021   22:32:43   (   0.01,-137.10) (   0.84,-133.45)  415.99                80
 06/28/2021   10:54:09   (  -0.01,-137.08) (   0.36,-138.62)  175.74                80
 06/29/2021   10:32:32   (  -0.01,-137.06) (  -0.68,-134.03)  345.54                80
 06/30/2021   22:54:08   (   0.00,-137.03) (  -0.50,-139.24)  251.98                80
 07/01/2021   22:37:51   (   0.00,-137.01) (   0.55,-134.66)  269.22                80