Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/06/2021   10:11:01   (  -0.18,-128.06) (  -0.11,-128.28)   25.84                80
 08/07/2021   09:54:43   (  -0.18,-128.08) (  -1.17,-123.70)  499.81                80
 08/08/2021   22:13:38   (   0.20,-128.01) (  -0.01,-128.90)  101.72                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.05,-124.32)  423.54                80
 08/11/2021   10:16:09   (  -0.21,-128.15) (   0.07,-129.50)  153.78                80
 08/12/2021   09:59:51   (  -0.20,-128.16) (  -0.92,-124.90)  371.42                80
 08/13/2021   22:18:46   (   0.22,-128.09) (  -0.24,-130.11)  230.46                80
 08/14/2021   22:02:29   (   0.21,-128.10) (   0.82,-125.53)  294.12                80
 08/16/2021   10:21:17   (  -0.23,-128.21) (   0.31,-130.71)  284.91                80
 08/17/2021   10:04:58   (  -0.22,-128.22) (  -0.69,-126.11)  239.29                80