Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 1.  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) (   0.24,-127.56)   25.35                80
 10/05/2021   22:12:48   (  -0.30,-127.85) (  -0.35,-128.18)   37.77                80
 10/06/2021   21:56:29   (  -0.31,-127.88) (   0.66,-123.59)  489.52                80
 10/08/2021   10:15:16   (   0.28,-127.94) (   0.45,-128.77)   93.38                80
 10/09/2021   09:58:58   (   0.30,-127.97) (  -0.56,-124.17)  433.36                80
 10/10/2021   22:17:54   (  -0.27,-127.99) (  -0.56,-129.39)  158.71                80
 10/11/2021   22:01:36   (  -0.28,-128.01) (   0.45,-124.79)  367.52                80
 10/13/2021   10:20:23   (   0.25,-128.07) (   0.66,-129.97)  216.86                80
 10/14/2021   10:04:05   (   0.26,-128.09) (  -0.36,-125.38)  309.12                80