Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/28/2019   10:13:56   (   0.06,-128.00) (   0.94,-131.79)  433.18                80
 04/29/2019   09:52:32   (   0.07,-128.02) (  -0.10,-127.27)   86.12                80
 05/01/2019   21:58:26   (  -0.07,-128.10) (  -0.04,-128.05)    5.91                80
 05/04/2019   10:01:31   (   0.06,-128.16) (   0.20,-128.80)   72.74                80
 05/05/2019   09:40:07   (   0.07,-128.18) (  -0.79,-124.27)  445.78                80
 05/06/2019   22:02:05   (  -0.05,-128.22) (  -0.34,-129.59)  155.55                80
 05/07/2019   21:46:00   (  -0.06,-128.23) (   0.65,-125.05)  362.72                80
 05/09/2019   10:05:10   (   0.05,-128.25) (   0.49,-130.33)  236.20                80
 05/10/2019   09:49:05   (   0.06,-128.27) (  -0.50,-125.80)  281.47                80