Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/03/2021   10:12:50   (   0.31,-127.78) (   0.25,-127.56)   25.54                80
 10/05/2021   22:12:47   (  -0.30,-127.85) (  -0.37,-128.18)   37.30                80
 10/06/2021   21:56:29   (  -0.31,-127.88) (   0.65,-123.58)  490.01                80
 10/08/2021   10:15:16   (   0.28,-127.95) (   0.47,-128.76)   92.78                80
 10/09/2021   09:58:58   (   0.30,-127.98) (  -0.55,-124.17)  434.01                80
 10/10/2021   22:17:54   (  -0.27,-128.00) (  -0.58,-129.38)  157.95                80
 10/11/2021   22:01:36   (  -0.28,-128.02) (   0.44,-124.79)  368.32                80
 10/13/2021   10:20:23   (   0.25,-128.07) (   0.67,-129.97)  215.95                80
 10/14/2021   10:04:04   (   0.26,-128.10) (  -0.34,-125.37)  310.07                80
 10/15/2021   22:23:01   (  -0.23,-128.11) (  -0.78,-130.59)  282.70                80