Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2021   10:57:31   (   0.03,-137.21) (   0.53,-139.46)  256.50                80
 09/21/2021   10:41:13   (   0.03,-137.21) (  -0.48,-134.86)  267.09                80
 09/22/2021   23:00:08   (  -0.03,-137.20) (  -0.69,-140.07)  327.08                80
 09/23/2021   22:43:50   (  -0.03,-137.20) (   0.38,-135.49)  196.26                80
 09/25/2021   11:02:37   (   0.03,-137.21) (   0.82,-140.65)  393.03                80
 09/26/2021   10:46:19   (   0.03,-137.20) (  -0.25,-136.07)  129.79                80
 09/27/2021   23:05:15   (  -0.02,-137.18) (  -0.92,-141.27)  465.96                80
 09/28/2021   22:48:56   (  -0.02,-137.17) (   0.09,-136.68)   56.29                80
 10/01/2021   10:48:45   (   0.01,-137.15) (   0.03,-137.26)   12.70                80
 10/03/2021   22:51:22   (  -0.00,-137.10) (  -0.19,-137.87)   88.15                80