Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/14/2021   23:00:22   (  -0.01,-137.19) (  -0.67,-140.22)  344.88                80
 06/15/2021   22:38:44   (  -0.01,-137.19) (   0.32,-135.62)  177.65                80
 06/17/2021   11:02:51   (   0.02,-137.18) (   0.83,-140.80)  412.58                80
 06/18/2021   10:41:14   (   0.01,-137.17) (  -0.21,-136.21)  109.61                80
 06/19/2021   23:05:30   (  -0.02,-137.16) (  -0.98,-141.42)  486.44                80
 06/20/2021   22:43:53   (  -0.01,-137.14) (   0.07,-136.84)   35.21                80
 06/23/2021   10:49:02   (  -0.00,-137.11) (   0.10,-137.41)   35.78                80
 06/24/2021   10:27:24   (  -0.01,-137.09) (  -0.95,-132.83)  485.19                80
 06/25/2021   22:49:00   (   0.01,-137.05) (  -0.24,-138.04)  112.85                80
 06/26/2021   22:32:43   (   0.01,-137.03) (   0.80,-133.45)  407.90                80