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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2021   10:15:10   (  -0.02,-127.88) (   0.08,-128.28)   45.65                80
 12/12/2021   09:59:27   (  -0.01,-127.85) (  -0.91,-123.83)  457.93                80
 12/13/2021   22:19:18   (   0.03,-127.81) (  -0.29,-129.27)  166.50                80
 12/14/2021   22:03:36   (   0.02,-127.77) (   0.71,-124.82)  337.06                80
 12/16/2021   10:23:16   (  -0.04,-127.72) (   0.54,-130.21)  284.28                80
 12/17/2021   10:07:34   (  -0.02,-127.68) (  -0.45,-125.76)  218.75                80
 12/18/2021   22:27:25   (   0.04,-127.62) (  -0.74,-131.20)  406.96                80
 12/19/2021   22:11:42   (   0.03,-127.58) (   0.20,-126.74)   95.84                80
 12/22/2021   10:13:00   (  -0.03,-127.47) (   0.00,-127.68)   24.07                80