Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/17/2021   10:47:42   (   0.03,-137.20) (  -0.17,-136.22)  111.12                80
 10/18/2021   23:06:39   (  -0.02,-137.19) (  -0.96,-141.44)  483.55                80
 10/19/2021   22:50:20   (  -0.03,-137.19) (   0.06,-136.84)   39.72                80
 10/22/2021   10:50:08   (   0.03,-137.19) (   0.07,-137.42)   26.50                80
 10/23/2021   10:33:50   (   0.03,-137.18) (  -0.95,-132.83)  496.13                80
 10/24/2021   22:52:45   (  -0.02,-137.15) (  -0.23,-138.03)  100.04                80
 10/25/2021   22:36:26   (  -0.02,-137.14) (   0.79,-133.43)  422.10                80
 10/27/2021   10:55:13   (   0.02,-137.13) (   0.35,-138.61)  168.74                80
 10/28/2021   10:38:54   (   0.02,-137.11) (  -0.67,-134.01)  352.91                80
 10/29/2021   22:57:50   (  -0.01,-137.07) (  -0.51,-139.22)  244.58                80
 10/30/2021   22:41:31   (  -0.01,-137.05) (   0.52,-134.62)  276.84                80