Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2021   22:03:36   (   0.02,-127.77) (   0.70,-124.82)  336.33                80
 12/16/2021   10:23:16   (  -0.04,-127.70) (   0.55,-130.20)  285.59                80
 12/17/2021   10:07:34   (  -0.02,-127.66) (  -0.44,-125.76)  217.15                80
 12/18/2021   22:27:25   (   0.04,-127.60) (  -0.75,-131.19)  408.85                80
 12/19/2021   22:11:41   (   0.03,-127.56) (   0.19,-126.73)   93.71                80
 12/22/2021   10:13:00   (  -0.03,-127.44) (   0.01,-127.68)   26.95                80
 12/23/2021   09:57:18   (  -0.03,-127.39) (  -0.98,-123.23)  474.92                80
 12/24/2021   22:17:08   (   0.04,-127.32) (  -0.25,-128.66)  152.21                80
 12/25/2021   22:01:26   (   0.04,-127.28) (   0.75,-124.21)  349.68                80
 12/27/2021   10:21:07   (  -0.05,-127.20) (   0.46,-129.60)  273.63                80