Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 28.  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   22:02:40   (   0.04,-128.48) (  -0.24,-129.72)  141.13                80
 12/30/2018   21:46:35   (   0.04,-128.47) (   0.74,-125.18)  374.35                80
 01/01/2019   10:05:43   (  -0.05,-128.56) (   0.39,-130.46)  216.17                80
 01/02/2019   09:49:39   (  -0.04,-128.55) (  -0.65,-125.93)  298.87                80
 01/03/2019   22:08:54   (   0.05,-128.41) (  -0.57,-131.23)  321.17                80
 01/04/2019   21:52:48   (   0.04,-128.39) (   0.41,-126.69)  193.74                80
 01/06/2019   10:11:57   (  -0.05,-128.48) (   0.72,-131.97)  397.27                80
 01/07/2019   09:55:51   (  -0.04,-128.46) (  -0.25,-127.43)  117.23                80
 01/09/2019   21:59:02   (   0.05,-128.29) (   0.08,-128.20)   10.74                80