Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 4 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/21/2019   21:45:49   (  -0.06,-127.79) (   0.56,-125.00)  318.39                80
 04/23/2019   10:07:38   (   0.06,-127.84) (   0.58,-130.28)  276.77                80
 04/24/2019   09:46:14   (   0.06,-127.88) (  -0.40,-125.74)  243.05                80
 04/25/2019   22:08:12   (  -0.06,-127.93) (  -0.75,-131.06)  356.60                80
 04/26/2019   21:52:08   (  -0.07,-127.96) (   0.23,-126.52)  163.28                80
 04/28/2019   10:13:57   (   0.06,-128.01) (   0.92,-131.80)  432.21                80
 04/29/2019   09:52:33   (   0.07,-128.04) (  -0.11,-127.28)   87.26                80
 05/01/2019   21:58:27   (  -0.07,-128.12) (  -0.06,-128.06)    6.11                80
 05/04/2019   10:01:33   (   0.06,-128.19) (   0.19,-128.82)   71.03                80