Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/14/2019   10:08:17   (   0.34,-128.13) (   0.82,-130.27)  243.59                80
 09/15/2019   09:46:53   (   0.35,-128.11) (  -0.21,-125.74)  270.07                80
 09/16/2019   22:08:48   (  -0.34,-128.04) (  -1.03,-131.03)  341.80                80
 09/17/2019   21:52:44   (  -0.34,-128.01) (  -0.01,-126.50)  172.01                80
 09/19/2019   10:14:32   (   0.33,-128.00) (   1.16,-131.77)  430.00                80
 09/20/2019   09:53:06   (   0.34,-127.96) (   0.19,-127.23)   82.91                80
 09/22/2019   21:56:18   (  -0.33,-127.84) (  -0.34,-128.01)   18.66                80
 09/23/2019   21:40:13   (  -0.33,-127.80) (   0.63,-123.46)  494.10                80
 09/25/2019   09:59:21   (   0.31,-127.78) (   0.52,-128.74)  109.39                80
 09/26/2019   09:40:37   (   0.32,-127.73) (  -0.50,-124.21)  402.63                80