Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/28/2021   10:54:09   (   0.02,-137.19) (   0.37,-138.61)  162.66                80
 06/29/2021   10:32:32   (   0.02,-137.19) (  -0.68,-134.03)  359.93                80
 06/30/2021   22:56:48   (  -0.03,-137.18) (  -0.49,-139.24)  235.00                80
 07/01/2021   22:35:10   (  -0.02,-137.17) (   0.56,-134.65)  287.53                80
 07/03/2021   10:59:17   (   0.02,-137.16) (   0.65,-139.82)  303.01                80
 07/04/2021   10:37:39   (   0.02,-137.15) (  -0.40,-135.23)  218.99                80
 07/05/2021   22:59:16   (  -0.01,-137.13) (  -0.75,-140.44)  377.28                80
 07/06/2021   22:42:58   (  -0.01,-137.12) (   0.30,-135.86)  144.31                80
 07/08/2021   11:04:25   (  -0.00,-137.10) (   0.85,-141.03)  447.80                80
 07/09/2021   10:42:47   (  -0.01,-137.08) (  -0.14,-136.44)   73.21                80