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) (   0.07,-128.28)   45.76                80
 12/12/2021   09:59:27   (  -0.01,-127.85) (  -0.92,-123.84)  457.75                80
 12/13/2021   22:19:18   (   0.03,-127.81) (  -0.28,-129.27)  166.73                80
 12/14/2021   22:03:35   (   0.02,-127.77) (   0.66,-124.81)  336.79                80
 12/16/2021   10:23:16   (  -0.04,-127.71) (   0.54,-130.21)  284.66                80
 12/17/2021   10:07:34   (  -0.02,-127.67) (  -0.46,-125.76)  218.31                80
 12/18/2021   22:27:24   (   0.04,-127.62) (  -0.79,-131.18)  407.47                80
 12/19/2021   22:11:42   (   0.03,-127.57) (   0.21,-126.74)   95.26                80
 12/22/2021   10:13:01   (  -0.03,-127.46) (  -0.01,-127.69)   24.90                80
 12/23/2021   09:57:17   (  -0.03,-127.42) (  -0.95,-123.23)  477.37                80