Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/08/2021   22:13:39   (   0.20,-128.01) (  -0.01,-128.90)  101.23                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.05,-124.32)  424.10                80
 08/11/2021   10:16:09   (  -0.21,-128.15) (   0.06,-129.50)  153.22                80
 08/12/2021   09:59:51   (  -0.20,-128.17) (  -0.93,-124.91)  372.07                80
 08/13/2021   22:18:46   (   0.22,-128.10) (  -0.23,-130.11)  229.59                80
 08/14/2021   22:02:28   (   0.21,-128.11) (   0.77,-125.52)  295.06                80
 08/16/2021   10:21:16   (  -0.23,-128.21) (   0.35,-130.70)  283.96                80
 08/17/2021   10:04:59   (  -0.23,-128.22) (  -0.70,-126.12)  240.31                80
 08/18/2021   22:23:54   (   0.25,-128.14) (  -0.45,-131.32)  362.37                80
 08/19/2021   22:07:35   (   0.24,-128.15) (   0.55,-126.73)  161.38                80