Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2019   21:56:17   (  -0.33,-127.86) (  -0.38,-127.99)   15.95                80
 09/23/2019   21:40:13   (  -0.33,-127.83) (   0.64,-123.46)  497.23                80
 09/25/2019   10:02:01   (   0.31,-127.79) (   0.50,-128.74)  107.33                80
 09/26/2019   09:40:36   (   0.32,-127.75) (  -0.47,-124.20)  405.01                80
 09/27/2019   22:02:32   (  -0.30,-127.67) (  -0.70,-129.50)  208.66                80
 09/28/2019   21:46:27   (  -0.31,-127.63) (   0.27,-124.96)  304.02                80
 09/30/2019   10:05:35   (   0.29,-127.60) (   0.87,-130.23)  300.14                80
 10/01/2019   09:49:29   (   0.30,-127.55) (  -0.10,-125.69)  211.95                80
 10/02/2019   22:08:46   (  -0.28,-127.46) (  -1.06,-131.00)  403.23                80
 10/03/2019   21:52:40   (  -0.29,-127.41) (  -0.09,-126.45)  108.90                80