Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/27/2021   10:24:01   (   0.33,-127.67) (   1.10,-130.94)  373.07                80
 09/28/2021   10:07:43   (   0.34,-127.63) (   0.03,-126.35)  146.26                80
 09/29/2021   22:26:38   (  -0.32,-127.55) (  -1.21,-131.56)  457.26                80
 09/30/2021   22:10:20   (  -0.32,-127.50) (  -0.20,-126.96)   61.52                80
 10/03/2021   10:10:09   (   0.31,-127.41) (   0.32,-127.55)   14.95                80
 10/05/2021   22:12:46   (  -0.29,-127.27) (  -0.49,-128.15)  100.27                80
 10/06/2021   21:56:27   (  -0.31,-127.23) (   0.52,-123.56)  418.10                80
 10/08/2021   10:15:13   (   0.28,-127.17) (   0.66,-128.72)  178.10                80
 10/09/2021   09:58:55   (   0.29,-127.12) (  -0.35,-124.13)  340.00                80
 10/10/2021   22:17:51   (  -0.27,-127.01) (  -0.77,-129.35)  265.42                80