Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/30/2021   22:10:20   (  -0.33,-127.67) (  -0.18,-126.97)   79.81                80
 10/03/2021   10:12:49   (   0.31,-127.78) (   0.29,-127.55)   25.52                80
 10/05/2021   22:12:47   (  -0.30,-127.85) (  -0.40,-128.17)   37.85                80
 10/06/2021   21:56:29   (  -0.31,-127.88) (   0.68,-123.59)  489.54                80
 10/08/2021   10:15:16   (   0.28,-127.94) (   0.50,-128.76)   93.34                80
 10/09/2021   09:58:58   (   0.30,-127.97) (  -0.58,-124.17)  433.46                80
 10/10/2021   22:17:53   (  -0.27,-127.99) (  -0.61,-129.38)  158.64                80
 10/11/2021   22:01:36   (  -0.28,-128.01) (   0.47,-124.80)  367.61                80
 10/13/2021   10:20:22   (   0.25,-128.07) (   0.70,-129.96)  216.70                80