Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/31/2021   10:37:05   (   0.05,-137.20) (  -0.53,-134.67)  288.62                80
 09/01/2021   22:58:41   (  -0.04,-137.20) (  -0.63,-139.88)  304.74                80
 09/02/2021   22:42:22   (  -0.04,-137.20) (   0.38,-135.28)  218.30                80
 09/04/2021   11:01:11   (   0.03,-137.20) (   0.74,-140.47)  372.47                80
 09/05/2021   10:44:52   (   0.02,-137.19) (  -0.26,-135.87)  150.14                80
 09/06/2021   23:03:47   (  -0.01,-137.18) (  -0.89,-141.08)  444.41                80
 09/07/2021   22:47:30   (  -0.01,-137.18) (   0.17,-136.50)   78.16                80
 09/10/2021   10:49:59   (   0.02,-137.15) (   0.00,-137.07)    8.84                80
 09/12/2021   22:49:56   (  -0.01,-137.11) (  -0.15,-137.68)   65.50                80