Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2021   09:52:18   (   0.07,-128.29) (  -0.17,-127.26)  117.89                80
 05/21/2021   22:14:15   (  -0.07,-128.25) (  -1.03,-132.56)  490.81                80
 05/22/2021   21:58:12   (  -0.07,-128.27) (   0.00,-128.04)   27.78                80
 05/25/2021   10:01:17   (   0.07,-128.39) (   0.17,-128.78)   44.71                80
 05/26/2021   09:39:53   (   0.07,-128.40) (  -0.87,-124.26)  472.57                80
 05/27/2021   22:01:50   (  -0.07,-128.35) (  -0.32,-129.56)  138.08                80
 05/28/2021   21:45:46   (  -0.07,-128.36) (   0.66,-125.02)  379.45                80
 05/30/2021   10:07:35   (   0.07,-128.45) (   0.49,-130.30)  211.54                80
 05/31/2021   09:46:12   (   0.07,-128.46) (  -0.55,-125.78)  305.43                80
 06/01/2021   22:08:08   (  -0.07,-128.39) (  -0.70,-131.07)  306.38                80
 06/02/2021   21:52:05   (  -0.08,-128.40) (   0.35,-126.55)  211.10                80