Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/22/2021   22:48:27   (  -0.05,-137.19) (  -0.12,-137.48)   32.67                80
 08/23/2021   22:32:09   (  -0.05,-137.20) (   0.94,-132.89)  491.11                80
 08/25/2021   10:53:36   (   0.04,-137.21) (   0.25,-138.06)   97.32                80
 08/26/2021   10:31:59   (   0.05,-137.21) (  -0.81,-133.48)  426.20                80
 08/27/2021   22:53:34   (  -0.04,-137.21) (  -0.35,-138.69)  168.03                80
 08/28/2021   22:37:16   (  -0.04,-137.21) (   0.66,-134.09)  355.16                80
 08/30/2021   10:58:43   (   0.04,-137.21) (   0.53,-139.26)  234.48                80
 08/31/2021   10:37:06   (   0.04,-137.21) (  -0.53,-134.68)  288.09                80
 09/01/2021   22:58:41   (  -0.03,-137.18) (  -0.62,-139.89)  307.82                80
 09/02/2021   22:42:22   (  -0.02,-137.17) (   0.38,-135.29)  214.27                80
 09/04/2021   11:01:11   (   0.00,-137.17) (   0.75,-140.47)  376.94                80