Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/16/2021   10:36:07   (   0.04,-137.21) (  -0.76,-133.67)  403.20                80
 09/17/2021   22:55:02   (  -0.03,-137.19) (  -0.41,-138.88)  191.84                80
 09/18/2021   22:38:43   (  -0.03,-137.19) (   0.60,-134.28)  331.26                80
 09/20/2021   10:57:31   (   0.02,-137.20) (   0.55,-139.46)  257.75                80
 09/21/2021   10:41:13   (   0.02,-137.20) (  -0.52,-134.87)  265.35                80
 09/22/2021   23:00:09   (  -0.02,-137.18) (  -0.65,-140.08)  329.90                80
 09/23/2021   22:43:50   (  -0.02,-137.18) (   0.36,-135.48)  192.91                80
 09/25/2021   11:02:37   (   0.02,-137.18) (   0.79,-140.66)  396.84                80
 09/26/2021   10:46:19   (   0.02,-137.17) (  -0.22,-136.06)  125.44                80
 09/27/2021   23:05:14   (  -0.02,-137.14) (  -0.95,-141.27)  471.32                80
 09/28/2021   22:48:56   (  -0.01,-137.12) (   0.06,-136.67)   50.50                80