Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/29/2018   22:02:41   (   0.05,-128.49) (  -0.22,-129.72)  140.06                80
 12/30/2018   21:46:35   (   0.04,-128.48) (   0.76,-125.18)  375.43                80
 01/01/2019   10:05:43   (  -0.05,-128.56) (   0.37,-130.46)  216.31                80
 01/02/2019   09:49:38   (  -0.04,-128.55) (  -0.61,-125.92)  298.74                80
 01/03/2019   22:08:54   (   0.05,-128.42) (  -0.56,-131.23)  320.01                80
 01/04/2019   21:52:49   (   0.04,-128.40) (   0.42,-126.69)  194.91                80
 01/06/2019   10:11:57   (  -0.05,-128.48) (   0.70,-131.97)  397.34                80
 01/07/2019   09:55:52   (  -0.04,-128.46) (  -0.27,-127.43)  117.18                80
 01/09/2019   21:59:02   (   0.05,-128.30) (   0.10,-128.21)   12.36                80
 01/12/2019   09:59:25   (  -0.05,-128.36) (   0.05,-128.95)   66.72                80