Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 3 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/12/2019   09:52:42   (   0.01,-128.40) (  -0.23,-127.34)  121.54                80
 03/13/2019   22:17:18   (  -0.02,-128.35) (  -0.97,-132.63)  488.52                80
 03/14/2019   21:55:52   (  -0.01,-128.34) (   0.03,-128.10)   27.30                80
 03/17/2019   09:58:54   (   0.02,-128.36) (   0.11,-128.83)   53.40                80
 03/18/2019   09:40:09   (   0.02,-128.35) (  -0.89,-124.30)  462.08                80
 03/19/2019   22:04:44   (  -0.02,-128.29) (  -0.31,-129.60)  149.06                80
 03/20/2019   21:43:18   (  -0.02,-128.27) (   0.70,-125.06)  366.18                80
 03/22/2019   10:05:05   (   0.02,-128.30) (   0.50,-130.32)  230.76                80
 03/23/2019   09:46:20   (   0.02,-128.29) (  -0.56,-125.80)  284.45                80
 03/24/2019   22:10:54   (  -0.02,-128.22) (  -0.69,-131.08)  327.07                80