Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/08/2021   22:56:27   (  -0.04,-137.21) (  -0.47,-139.05)  210.37                80
 10/09/2021   22:40:10   (  -0.04,-137.20) (   0.60,-134.47)  312.45                80
 10/11/2021   10:58:56   (   0.03,-137.19) (   0.56,-139.64)  278.10                80
 10/12/2021   10:42:38   (   0.03,-137.18) (  -0.46,-135.04)  244.09                80
 10/13/2021   23:01:33   (  -0.02,-137.16) (  -0.74,-140.24)  352.08                80
 10/14/2021   22:45:15   (  -0.02,-137.15) (   0.34,-135.66)  169.91                80
 10/16/2021   11:04:02   (   0.01,-137.13) (   0.82,-140.83)  421.33                80
 10/17/2021   10:47:43   (   0.01,-137.12) (  -0.20,-136.24)  100.65                80
 10/18/2021   23:06:39   (  -0.01,-137.09) (  -0.99,-141.44)  495.68                80
 10/19/2021   22:50:20   (  -0.01,-137.08) (   0.03,-136.84)   26.18                80