Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/24/2021   22:44:11   (   0.05,-137.21) (  -0.06,-137.67)   53.35                80
 02/25/2021   22:27:53   (   0.04,-137.20) (   0.96,-133.08)  469.19                80
 02/27/2021   10:49:22   (  -0.04,-137.20) (   0.18,-138.27)  121.36                80
 02/28/2021   10:27:44   (  -0.04,-137.19) (  -0.83,-133.68)  400.76                80
 03/01/2021   22:49:22   (   0.03,-137.18) (  -0.34,-138.90)  195.48                80
 03/02/2021   22:33:04   (   0.04,-137.17) (   0.67,-134.31)  326.30                80
 03/04/2021   10:54:32   (  -0.03,-137.16) (   0.47,-139.49)  265.42                80
 03/05/2021   10:32:55   (  -0.03,-137.14) (  -0.55,-134.90)  255.75                80
 03/06/2021   22:54:32   (   0.03,-137.11) (  -0.62,-140.12)  342.05                80
 03/07/2021   22:38:15   (   0.02,-137.09) (   0.40,-135.53)  178.93                80
 03/09/2021   10:59:42   (  -0.01,-137.07) (   0.81,-140.70)  413.69                80
 03/10/2021   10:38:05   (  -0.00,-137.05) (  -0.21,-136.11)  106.96                80