Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 3 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2019   21:49:41   (   0.00,-128.36) (   0.40,-126.61)  199.84                80
 03/11/2019   10:11:28   (   0.00,-128.40) (   0.76,-131.88)  395.70                80
 03/12/2019   09:55:23   (  -0.00,-128.40) (  -0.23,-127.34)  120.39                80
 03/13/2019   22:17:19   (  -0.00,-128.34) (  -0.94,-132.64)  489.97                80
 03/14/2019   21:55:54   (  -0.00,-128.33) (   0.04,-128.11)   25.47                80
 03/17/2019   09:58:57   (   0.00,-128.35) (   0.11,-128.85)   56.81                80
 03/18/2019   09:42:52   (   0.00,-128.33) (  -0.92,-124.32)  458.18                80
 03/19/2019   22:04:47   (  -0.00,-128.27) (  -0.32,-129.61)  153.48                80
 03/20/2019   21:43:23   (  -0.00,-128.25) (   0.70,-125.08)  361.26                80
 03/22/2019   10:05:11   (   0.00,-128.27) (   0.44,-130.36)  237.04                80