Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2021   22:29:34   (   0.02,-128.00) (  -0.86,-131.79)  432.00                80
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.13,-127.34)   71.77                80
 12/11/2021   10:15:10   (  -0.02,-127.89) (   0.07,-128.29)   45.41                80
 12/12/2021   09:59:27   (  -0.01,-127.86) (  -0.92,-123.84)  458.24                80
 12/13/2021   22:19:19   (   0.03,-127.81) (  -0.28,-129.27)  166.12                80
 12/14/2021   22:03:36   (   0.02,-127.78) (   0.71,-124.83)  337.52                80
 12/16/2021   10:23:17   (  -0.04,-127.72) (   0.54,-130.21)  283.74                80
 12/17/2021   10:07:34   (  -0.02,-127.69) (  -0.45,-125.76)  219.36                80
 12/18/2021   22:27:25   (   0.04,-127.63) (  -0.75,-131.20)  406.25                80
 12/19/2021   22:11:43   (   0.03,-127.59) (   0.25,-126.75)   96.63                80