Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2018   22:15:11   (   0.04,-128.54) (  -0.90,-132.74)  478.38                80
 12/24/2018   21:59:06   (   0.03,-128.53) (   0.07,-128.20)   37.61                80
 12/27/2018   09:59:30   (  -0.03,-128.62) (   0.02,-128.95)   37.26                80
 12/28/2018   09:43:24   (  -0.03,-128.61) (  -0.95,-124.41)  478.15                80
 12/29/2018   22:02:41   (   0.04,-128.48) (  -0.22,-129.72)  140.87                80
 12/30/2018   21:46:35   (   0.03,-128.47) (   0.76,-125.18)  374.67                80
 01/01/2019   10:05:43   (  -0.05,-128.57) (   0.37,-130.46)  215.68                80
 01/02/2019   09:49:38   (  -0.04,-128.56) (  -0.61,-125.92)  299.41                80
 01/03/2019   22:08:54   (   0.05,-128.42) (  -0.56,-131.23)  320.64                80
 01/04/2019   21:52:49   (   0.04,-128.40) (   0.42,-126.69)  194.34                80