Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/03/2021   22:05:44   (  -0.02,-128.12) (   0.61,-125.42)  309.16                80
 12/05/2021   10:25:26   (  -0.01,-128.07) (   0.58,-130.81)  311.51                80
 12/06/2021   10:09:42   (   0.01,-128.04) (  -0.35,-126.35)  192.30                80
 12/07/2021   22:29:33   (   0.02,-128.00) (  -0.85,-131.79)  431.98                80
 12/08/2021   22:13:51   (   0.01,-127.97) (   0.14,-127.34)   71.81                80
 12/11/2021   10:15:10   (  -0.02,-127.89) (   0.05,-128.29)   45.22                80
 12/12/2021   09:59:26   (  -0.01,-127.86) (  -0.89,-123.83)  458.54                80
 12/13/2021   22:19:18   (   0.03,-127.81) (  -0.31,-129.27)  165.83                80
 12/14/2021   22:03:35   (   0.02,-127.78) (   0.69,-124.82)  337.85                80
 12/16/2021   10:23:16   (  -0.04,-127.73) (   0.50,-130.22)  283.22                80