Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 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)
 08/06/2021   10:11:01   (  -0.19,-128.06) (  -0.11,-128.28)   25.74                80
 08/07/2021   09:54:43   (  -0.18,-128.08) (  -1.17,-123.70)  499.92                80
 08/08/2021   22:13:39   (   0.20,-128.01) (  -0.01,-128.90)  101.44                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.05,-124.32)  423.85                80
 08/11/2021   10:16:09   (  -0.21,-128.15) (   0.07,-129.50)  153.54                80
 08/12/2021   09:59:51   (  -0.20,-128.17) (  -0.92,-124.90)  371.69                80
 08/13/2021   22:18:46   (   0.22,-128.10) (  -0.25,-130.11)  230.03                80
 08/14/2021   22:02:29   (   0.21,-128.11) (   0.81,-125.53)  294.57                80
 08/16/2021   10:21:17   (  -0.23,-128.21) (   0.32,-130.71)  284.53                80
 08/17/2021   10:04:59   (  -0.23,-128.22) (  -0.68,-126.11)  239.69                80
 08/18/2021   22:23:54   (   0.25,-128.14) (  -0.48,-131.32)  363.06                80
 08/19/2021   22:07:36   (   0.24,-128.14) (   0.58,-126.74)  160.64                80