Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2021   10:23:17   (  -0.04,-127.70) (   0.51,-130.21)  285.75                80
 12/17/2021   10:07:34   (  -0.02,-127.66) (  -0.48,-125.76)  216.93                80
 12/18/2021   22:27:25   (   0.04,-127.60) (  -0.77,-131.19)  409.10                80
 12/19/2021   22:11:42   (   0.03,-127.56) (   0.22,-126.74)   93.36                80
 12/22/2021   10:13:00   (  -0.03,-127.44) (   0.04,-127.67)   27.61                80
 12/23/2021   09:57:18   (  -0.03,-127.39) (  -0.96,-123.23)  474.23                80
 12/24/2021   22:17:08   (   0.05,-127.32) (  -0.28,-128.65)  152.94                80
 12/25/2021   22:01:25   (   0.04,-127.27) (   0.72,-124.21)  348.90                80
 12/27/2021   10:21:07   (  -0.05,-127.19) (   0.49,-129.60)  274.56                80
 12/28/2021   10:05:24   (  -0.05,-127.14) (  -0.51,-125.15)  226.76                80
 12/29/2021   22:25:14   (   0.06,-127.05) (  -0.71,-130.58)  401.65                80