Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2019   21:58:26   (  -0.07,-128.10) (  -0.07,-128.05)    6.13                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)  445.73                80
 05/06/2019   22:02:04   (  -0.06,-128.22) (  -0.36,-129.58)  155.37                80
 05/07/2019   21:46:00   (  -0.06,-128.23) (   0.63,-125.04)  362.88                80
 05/09/2019   10:05:09   (   0.05,-128.25) (   0.51,-130.33)  236.26                80
 05/10/2019   09:49:05   (   0.06,-128.26) (  -0.47,-125.79)  281.41                80
 05/11/2019   22:08:22   (  -0.05,-128.29) (  -0.70,-131.10)  321.29                80
 05/12/2019   21:52:19   (  -0.06,-128.30) (   0.35,-126.58)  196.41                80
 05/14/2019   10:11:27   (   0.05,-128.31) (   0.86,-131.84)  403.11                80