Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/12/2021   10:42:37   (   0.03,-137.21) (  -0.45,-135.04)  247.20                80
 10/13/2021   23:01:33   (  -0.03,-137.20) (  -0.74,-140.24)  347.67                80
 10/14/2021   22:45:15   (  -0.02,-137.20) (   0.33,-135.66)  175.66                80
 10/16/2021   11:04:02   (   0.02,-137.21) (   0.82,-140.83)  412.72                80
 10/17/2021   10:47:43   (   0.02,-137.21) (  -0.19,-136.23)  110.61                80
 10/18/2021   23:06:38   (  -0.01,-137.19) (  -1.00,-141.44)  484.38                80
 10/19/2021   22:50:21   (  -0.02,-137.19) (   0.08,-136.85)   38.86                80
 10/22/2021   10:50:09   (   0.02,-137.19) (   0.06,-137.43)   27.28                80
 10/23/2021   10:33:50   (   0.02,-137.18) (  -0.96,-132.83)  495.32                80
 10/24/2021   22:52:46   (  -0.02,-137.15) (  -0.23,-138.04)  101.16                80
 10/25/2021   22:36:27   (  -0.01,-137.14) (   0.80,-133.44)  420.88                80