Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2021   10:09:43   (   0.01,-128.04) (  -0.37,-126.36)  192.25                80
 12/07/2021   22:29:34   (   0.02,-128.00) (  -0.84,-131.79)  431.95                80
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.15,-127.34)   71.81                80
 12/11/2021   10:15:10   (  -0.02,-127.89) (   0.05,-128.29)   45.35                80
 12/12/2021   09:59:28   (  -0.01,-127.86) (  -0.94,-123.84)  458.36                80
 12/13/2021   22:19:18   (   0.03,-127.82) (  -0.32,-129.26)  165.99                80
 12/14/2021   22:03:36   (   0.02,-127.78) (   0.67,-124.82)  337.67                80
 12/16/2021   10:23:17   (  -0.04,-127.73) (   0.53,-130.21)  283.56                80
 12/17/2021   10:07:34   (  -0.02,-127.69) (  -0.46,-125.76)  219.55                80
 12/18/2021   22:27:26   (   0.04,-127.63) (  -0.74,-131.20)  406.04                80
 12/19/2021   22:11:42   (   0.03,-127.59) (   0.20,-126.74)   96.84                80