Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 11 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/22/2021   11:04:50   (   0.01,-137.20) (   0.80,-140.72)  400.72                80
 11/23/2021   10:49:09   (   0.01,-137.19) (  -0.22,-136.28)  104.85                80
 11/25/2021   22:50:39   (  -0.01,-137.16) (  -0.05,-137.26)   12.25                80
 11/26/2021   22:34:58   (  -0.01,-137.15) (   0.99,-132.83)  492.83                80
 11/28/2021   10:57:20   (   0.00,-137.13) (   0.27,-138.22)  125.08                80
 11/29/2021   10:36:20   (   0.00,-137.11) (  -0.75,-133.79)  379.22                80
 11/30/2021   22:58:53   (  -0.00,-137.08) (  -0.49,-139.22)  244.67                80
 12/01/2021   22:43:13   (  -0.00,-137.06) (   0.50,-134.78)  259.03                80
 12/03/2021   11:05:37   (   0.00,-137.03) (   0.72,-140.19)  360.71                80
 12/04/2021   10:44:37   (   0.00,-137.00) (  -0.25,-135.75)  142.03                80