Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.14,-127.34)   71.70                80
 12/11/2021   10:15:10   (  -0.02,-127.89) (   0.06,-128.29)   45.57                80
 12/12/2021   09:59:28   (  -0.01,-127.85) (  -0.93,-123.84)  458.06                80
 12/13/2021   22:19:18   (   0.03,-127.81) (  -0.33,-129.26)  166.36                80
 12/14/2021   22:03:35   (   0.02,-127.78) (   0.67,-124.82)  337.26                80
 12/16/2021   10:23:17   (  -0.04,-127.72) (   0.53,-130.21)  284.02                80
 12/17/2021   10:07:34   (  -0.02,-127.68) (  -0.47,-125.76)  219.05                80
 12/18/2021   22:27:24   (   0.04,-127.63) (  -0.78,-131.19)  406.62                80
 12/19/2021   22:11:42   (   0.03,-127.59) (   0.21,-126.74)   96.19                80