Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2021   22:00:08   (  -0.38,-127.86) (   0.35,-124.58)  374.27                80
 09/22/2021   10:18:55   (   0.36,-127.86) (   0.80,-129.75)  216.42                80
 09/23/2021   10:02:37   (   0.37,-127.83) (  -0.21,-125.16)  303.87                80
 09/24/2021   22:21:32   (  -0.35,-127.74) (  -0.96,-130.36)  299.70                80
 09/25/2021   22:05:13   (  -0.36,-127.70) (   0.05,-125.77)  220.06                80
 09/27/2021   10:24:01   (   0.33,-127.68) (   1.09,-130.94)  372.10                80
 09/28/2021   10:07:42   (   0.34,-127.65) (   0.07,-126.35)  147.40                80
 09/29/2021   22:26:38   (  -0.32,-127.55) (  -1.25,-131.55)  457.24                80
 09/30/2021   22:10:20   (  -0.32,-127.51) (  -0.18,-126.97)   61.76                80
 10/03/2021   10:10:08   (   0.31,-127.43) (   0.35,-127.54)   13.07                80