Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/18/2021   22:38:44   (  -0.03,-137.19) (   0.65,-134.29)  331.46                80
 09/20/2021   10:57:30   (   0.03,-137.19) (   0.56,-139.45)  258.03                80
 09/21/2021   10:41:13   (   0.03,-137.19) (  -0.50,-134.87)  264.92                80
 09/22/2021   23:00:08   (  -0.03,-137.18) (  -0.67,-140.08)  330.29                80
 09/23/2021   22:43:50   (  -0.03,-137.17) (   0.34,-135.48)  192.39                80
 09/25/2021   11:02:37   (   0.03,-137.16) (   0.80,-140.66)  397.81                80
 09/26/2021   10:46:19   (   0.03,-137.15) (  -0.21,-136.06)  124.34                80
 09/27/2021   23:05:14   (  -0.02,-137.12) (  -0.96,-141.27)  472.42                80
 09/28/2021   22:48:55   (  -0.02,-137.11) (   0.05,-136.67)   49.29                80
 10/01/2021   10:48:44   (   0.01,-137.07) (   0.08,-137.25)   21.59                80