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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/11/2021   10:58:55   (   0.04,-137.19) (   0.59,-139.63)  277.75                80
 10/12/2021   10:42:37   (   0.03,-137.18) (  -0.43,-135.03)  244.48                80
 10/13/2021   23:01:33   (  -0.03,-137.16) (  -0.70,-140.25)  351.85                80
 10/14/2021   22:45:15   (  -0.02,-137.15) (   0.31,-135.65)  170.16                80
 10/16/2021   11:04:01   (   0.02,-137.13) (   0.84,-140.82)  420.79                80
 10/17/2021   10:47:43   (   0.02,-137.12) (  -0.18,-136.23)  101.22                80
 10/18/2021   23:06:38   (  -0.01,-137.09) (  -1.01,-141.43)  495.23                80
 10/19/2021   22:50:19   (  -0.02,-137.08) (   0.01,-136.84)   26.85                80
 10/22/2021   10:50:07   (   0.02,-137.04) (   0.12,-137.41)   43.32                80
 10/23/2021   10:33:49   (   0.02,-137.02) (  -0.90,-132.82)  478.02                80