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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/17/2021   11:02:51   (   0.02,-137.20) (   0.84,-140.80)  409.98                80
 06/18/2021   10:41:13   (   0.02,-137.20) (  -0.20,-136.21)  112.94                80
 06/19/2021   23:05:30   (  -0.02,-137.19) (  -0.99,-141.42)  481.98                80
 06/20/2021   22:43:52   (  -0.02,-137.19) (   0.06,-136.83)   40.41                80
 06/23/2021   10:49:02   (   0.01,-137.17) (   0.04,-137.42)   28.59                80
 06/24/2021   10:27:24   (  -0.00,-137.16) (  -0.95,-132.83)  493.12                80
 06/25/2021   22:51:41   (   0.00,-137.13) (  -0.17,-138.05)  103.86                80
 06/26/2021   22:30:02   (   0.01,-137.12) (   0.82,-133.45)  417.61                80
 06/28/2021   10:54:10   (  -0.01,-137.10) (   0.33,-138.63)  174.14                80
 06/29/2021   10:32:32   (  -0.01,-137.08) (  -0.72,-134.04)  347.29                80
 06/30/2021   22:54:08   (   0.01,-137.05) (  -0.51,-139.24)  249.82                80