Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 6 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)
 06/19/2020   10:44:31   (   0.01,-137.20) (   0.22,-138.13)  107.08                80
 06/20/2020   10:22:55   (  -0.00,-137.19) (  -0.79,-133.55)  414.30                80
 06/21/2020   22:47:14   (   0.00,-137.18) (  -0.37,-138.78)  183.15                80
 06/22/2020   22:25:39   (   0.01,-137.17) (   0.70,-134.21)  337.80                80
 06/24/2020   10:49:48   (  -0.01,-137.16) (   0.48,-139.40)  255.42                80
 06/25/2020   10:28:12   (  -0.01,-137.14) (  -0.53,-134.82)  265.20                80
 06/26/2020   22:49:50   (   0.01,-137.12) (  -0.68,-140.04)  333.24                80
 06/27/2020   22:33:35   (   0.01,-137.11) (   0.39,-135.47)  187.20                80
 06/29/2020   10:55:04   (  -0.00,-137.08) (   0.78,-140.66)  406.91                80
 06/30/2020   10:36:07   (  -0.01,-137.06) (  -0.23,-136.07)  113.07                80
 07/01/2020   22:55:06   (   0.00,-137.03) (  -0.97,-141.29)  486.43                80