Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/05/2021   22:12:47   (  -0.30,-127.85) (  -0.39,-128.17)   36.66                80
 10/06/2021   21:56:29   (  -0.31,-127.89) (   0.68,-123.59)  490.88                80
 10/08/2021   10:15:16   (   0.29,-127.96) (   0.49,-128.76)   91.84                80
 10/09/2021   09:58:58   (   0.30,-127.98) (  -0.59,-124.17)  435.14                80
 10/10/2021   22:17:53   (  -0.27,-128.01) (  -0.60,-129.38)  156.51                80
 10/11/2021   22:01:35   (  -0.28,-128.03) (   0.42,-124.78)  369.93                80
 10/13/2021   10:20:22   (   0.25,-128.09) (   0.68,-129.96)  214.24                80
 10/14/2021   10:04:04   (   0.26,-128.11) (  -0.34,-125.37)  311.95                80
 10/15/2021   22:23:00   (  -0.23,-128.13) (  -0.79,-130.59)  280.49                80
 10/16/2021   22:06:42   (  -0.24,-128.15) (   0.23,-125.99)  245.81                80