Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2021   22:56:48   (  -0.03,-137.19) (  -0.49,-139.24)  233.85                80
 07/01/2021   22:35:11   (  -0.03,-137.18) (   0.56,-134.65)  288.94                80
 07/03/2021   10:59:17   (   0.03,-137.18) (   0.64,-139.82)  301.23                80
 07/04/2021   10:37:39   (   0.02,-137.17) (  -0.41,-135.23)  221.03                80
 07/05/2021   22:59:16   (  -0.02,-137.16) (  -0.77,-140.44)  374.82                80
 07/06/2021   22:42:58   (  -0.01,-137.15) (   0.28,-135.86)  146.97                80
 07/08/2021   11:04:26   (  -0.00,-137.13) (   0.87,-141.03)  444.78                80
 07/09/2021   10:42:48   (  -0.01,-137.11) (  -0.18,-136.45)   76.48                80
 07/11/2021   22:48:06   (   0.01,-137.07) (  -0.00,-137.06)    1.87                80