Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/09/2019   10:02:02   (   0.36,-128.25) (   0.49,-128.77)   59.51                80
 09/10/2019   09:40:38   (   0.36,-128.22) (  -0.53,-124.24)  454.45                80
 09/11/2019   22:02:34   (  -0.35,-128.16) (  -0.66,-129.54)  156.60                80
 09/12/2019   21:46:30   (  -0.35,-128.14) (   0.37,-125.01)  357.75                80
 09/14/2019   10:08:17   (   0.34,-128.14) (   0.84,-130.27)  243.05                80
 09/15/2019   09:46:52   (   0.35,-128.11) (  -0.19,-125.74)  270.75                80
 09/16/2019   22:08:49   (  -0.34,-128.04) (  -0.99,-131.04)  341.65                80
 09/17/2019   21:52:43   (  -0.34,-128.02) (  -0.02,-126.50)  172.29                80
 09/19/2019   10:11:52   (   0.33,-128.01) (   1.17,-131.77)  428.83                80
 09/20/2019   09:53:07   (   0.34,-127.98) (   0.15,-127.24)   84.25                80