Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/25/2021   22:51:40   (  -0.01,-137.20) (  -0.23,-138.03)   95.87                80
 06/26/2021   22:30:02   (  -0.01,-137.19) (   0.82,-133.44)  427.02                80
 06/28/2021   10:54:10   (   0.01,-137.20) (   0.32,-138.62)  162.16                80
 06/29/2021   10:32:31   (   0.01,-137.19) (  -0.67,-134.02)  360.62                80
 06/30/2021   22:54:09   (  -0.02,-137.18) (  -0.46,-139.25)  234.69                80
 07/01/2021   22:37:50   (  -0.02,-137.18) (   0.53,-134.65)  288.03                80
 07/03/2021   10:59:17   (   0.02,-137.18) (   0.60,-139.82)  301.64                80
 07/04/2021   10:37:40   (   0.01,-137.17) (  -0.44,-135.24)  220.51                80
 07/05/2021   22:59:16   (  -0.00,-137.15) (  -0.73,-140.45)  376.16                80
 07/06/2021   22:42:59   (   0.00,-137.13) (   0.32,-135.86)  145.60                80
 07/08/2021   11:04:25   (  -0.01,-137.12) (   0.89,-141.03)  445.57                80