Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/19/2021   11:07:27   (   0.04,-137.18) (   1.01,-141.45)  486.89                80
 08/20/2021   10:45:50   (   0.04,-137.18) (  -0.05,-136.87)   35.36                80
 08/22/2021   22:48:27   (  -0.02,-137.15) (  -0.11,-137.48)   38.39                80
 08/23/2021   22:32:09   (  -0.02,-137.14) (   0.95,-132.90)  483.95                80
 08/25/2021   10:50:57   (   0.02,-137.13) (   0.23,-138.07)  106.84                80
 08/26/2021   10:34:38   (   0.02,-137.12) (  -0.77,-133.47)  415.27                80
 08/27/2021   22:53:33   (  -0.02,-137.09) (  -0.38,-138.68)  181.05                80
 08/28/2021   22:37:16   (  -0.02,-137.08) (   0.68,-134.10)  340.69                80
 08/30/2021   10:56:03   (   0.01,-137.06) (   0.50,-139.27)  251.35                80
 08/31/2021   10:39:45   (   0.00,-137.04) (  -0.51,-134.67)  269.71                80