Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2019   22:08:12   (  -0.06,-127.93) (  -0.76,-131.05)  356.24                80
 04/26/2019   21:52:07   (  -0.07,-127.96) (   0.23,-126.52)  163.47                80
 04/28/2019   10:13:56   (   0.06,-128.00) (   0.91,-131.80)  433.21                80
 04/29/2019   09:52:32   (   0.07,-128.02) (  -0.07,-127.26)   86.14                80
 05/01/2019   21:58:26   (  -0.07,-128.10) (  -0.07,-128.05)    5.80                80
 05/04/2019   10:01:31   (   0.06,-128.16) (   0.22,-128.79)   72.83                80
 05/05/2019   09:40:07   (   0.07,-128.18) (  -0.82,-124.27)  445.72                80
 05/06/2019   22:02:04   (  -0.05,-128.21) (  -0.36,-129.58)  155.76                80
 05/07/2019   21:46:00   (  -0.06,-128.23) (   0.63,-125.05)  362.50                80
 05/09/2019   10:05:09   (   0.05,-128.25) (   0.51,-130.33)  236.23                80