Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/14/2021   11:02:21   (   0.05,-137.20) (   0.72,-140.26)  347.85                80
 08/15/2021   10:40:42   (   0.05,-137.20) (  -0.28,-135.66)  175.12                80
 08/16/2021   23:02:18   (  -0.04,-137.19) (  -0.89,-140.87)  419.74                80
 08/17/2021   22:46:00   (  -0.04,-137.18) (   0.17,-136.28)  102.66                80
 08/19/2021   11:07:27   (   0.03,-137.17) (   1.01,-141.45)  488.31                80
 08/20/2021   10:48:30   (   0.02,-137.16) (  -0.04,-136.87)   33.64                80
 08/22/2021   22:48:28   (  -0.00,-137.13) (  -0.06,-137.49)   40.53                80
 08/23/2021   22:32:09   (  -0.00,-137.12) (   0.94,-132.90)  481.74                80
 08/25/2021   10:50:57   (   0.00,-137.11) (   0.24,-138.07)  109.49                80
 08/26/2021   10:34:39   (   0.01,-137.10) (  -0.82,-133.48)  412.48                80
 08/27/2021   22:53:33   (  -0.00,-137.07) (  -0.39,-138.68)  183.90                80