Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2021   10:11:23   (   0.41,-128.15) (   0.25,-127.36)   89.22                80
 09/14/2021   22:11:20   (  -0.40,-128.03) (  -0.41,-127.98)    6.51                80
 09/17/2021   10:13:50   (   0.38,-128.01) (   0.50,-128.57)   62.80                80
 09/18/2021   09:57:31   (   0.39,-127.99) (  -0.51,-123.97)  457.70                80
 09/19/2021   22:16:27   (  -0.37,-127.90) (  -0.66,-129.18)  146.16                80
 09/20/2021   22:00:08   (  -0.38,-127.87) (   0.35,-124.58)  374.26                80
 09/22/2021   10:18:55   (   0.36,-127.87) (   0.81,-129.76)  215.33                80
 09/23/2021   10:02:38   (   0.37,-127.84) (  -0.26,-125.17)  305.20                80
 09/24/2021   22:21:33   (  -0.35,-127.75) (  -0.91,-130.38)  298.87                80
 09/25/2021   22:05:15   (  -0.36,-127.72) (   0.10,-125.78)  221.06                80