Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2021   21:54:31   (  -0.04,-127.65) (   0.73,-124.29)  383.95                80
 05/03/2021   10:16:00   (   0.05,-127.77) (   0.43,-129.47)  194.18                80
 05/04/2021   09:54:22   (   0.04,-127.80) (  -0.60,-124.88)  332.63                80
 05/05/2021   22:15:58   (  -0.05,-127.81) (  -0.55,-130.09)  260.11                80
 05/06/2021   21:59:41   (  -0.05,-127.85) (   0.48,-125.51)  267.42                80
 05/08/2021   10:21:09   (   0.05,-127.97) (   0.68,-130.69)  309.78                80
 05/09/2021   09:59:32   (   0.04,-128.01) (  -0.35,-126.10)  216.86                80
 05/10/2021   22:21:08   (  -0.05,-128.00) (  -0.80,-131.31)  377.57                80
 05/11/2021   22:04:51   (  -0.04,-128.04) (   0.23,-126.73)  149.37                80
 05/13/2021   10:26:20   (   0.04,-128.16) (   0.86,-131.92)  427.96                80
 05/14/2021   10:04:42   (   0.04,-128.19) (  -0.17,-127.33)   97.91                80