Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/03/2021   22:32:50   (   0.02,-137.21) (   0.65,-134.57)  301.36                80
 01/05/2021   10:54:18   (  -0.03,-137.20) (   0.56,-139.75)  290.96                80
 01/06/2021   10:32:42   (  -0.03,-137.19) (  -0.49,-135.17)  230.76                80
 01/07/2021   22:54:18   (   0.02,-137.18) (  -0.71,-140.38)  365.37                80
 01/08/2021   22:38:01   (   0.01,-137.16) (   0.34,-135.80)  156.20                80
 01/10/2021   10:59:30   (   0.01,-137.14) (   0.86,-140.97)  436.85                80
 01/11/2021   10:37:52   (   0.01,-137.12) (  -0.14,-136.38)   83.89                80
 01/13/2021   22:43:12   (  -0.01,-137.07) (  -0.01,-137.01)    6.74                80
 01/16/2021   10:45:44   (   0.01,-137.02) (   0.15,-137.61)   67.22                80