Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/20/2021   22:43:52   (  -0.02,-137.18) (   0.06,-136.83)   40.01                80
 06/23/2021   10:49:01   (   0.01,-137.16) (   0.09,-137.41)   28.91                80
 06/24/2021   10:27:24   (   0.00,-137.15) (  -0.96,-132.83)  492.68                80
 06/25/2021   22:51:40   (  -0.00,-137.12) (  -0.23,-138.03)  104.38                80
 06/26/2021   22:32:43   (   0.00,-137.11) (   0.82,-133.45)  417.06                80
 06/28/2021   10:54:10   (  -0.00,-137.09) (   0.32,-138.63)  174.56                80
 06/29/2021   10:32:31   (  -0.00,-137.08) (  -0.67,-134.03)  346.83                80
 06/30/2021   22:54:08   (  -0.00,-137.05) (  -0.52,-139.24)  250.43                80
 07/01/2021   22:37:50   (   0.00,-137.03) (   0.53,-134.65)  270.88                80
 07/03/2021   10:59:17   (  -0.00,-137.01) (   0.61,-139.83)  321.20                80