Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/19/2021   10:13:42   (   0.07,-128.27) (   0.85,-131.78)  400.36                80
 05/20/2021   09:52:18   (   0.07,-128.29) (  -0.19,-127.26)  117.85                80
 05/21/2021   22:14:16   (  -0.07,-128.25) (  -1.01,-132.56)  491.07                80
 05/22/2021   21:58:11   (  -0.07,-128.27) (  -0.04,-128.03)   27.43                80
 05/25/2021   10:01:17   (   0.07,-128.38) (   0.15,-128.78)   45.16                80
 05/26/2021   09:39:53   (   0.06,-128.40) (  -0.89,-124.26)  472.05                80
 05/27/2021   22:01:50   (  -0.07,-128.34) (  -0.37,-129.55)  138.80                80
 05/28/2021   21:45:46   (  -0.07,-128.35) (   0.67,-125.03)  378.66                80
 05/30/2021   10:07:36   (   0.07,-128.44) (   0.48,-130.31)  212.36                80
 05/31/2021   09:46:11   (   0.07,-128.45) (  -0.50,-125.77)  304.53                80
 06/01/2021   22:08:08   (  -0.07,-128.38) (  -0.69,-131.08)  307.42                80