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)
 12/22/2018   09:55:55   (  -0.02,-128.66) (  -0.27,-127.43)  139.75                80
 12/23/2018   22:15:11   (   0.04,-128.54) (  -0.91,-132.74)  478.77                80
 12/24/2018   21:59:07   (   0.03,-128.53) (   0.12,-128.21)   37.13                80
 12/27/2018   09:59:30   (  -0.03,-128.62) (   0.03,-128.96)   37.70                80
 12/28/2018   09:43:24   (  -0.03,-128.61) (  -0.94,-124.42)  477.61                80
 12/29/2018   22:02:41   (   0.04,-128.48) (  -0.22,-129.72)  141.66                80
 12/30/2018   21:46:35   (   0.03,-128.47) (   0.76,-125.19)  373.81                80
 01/01/2019   10:05:43   (  -0.05,-128.57) (   0.38,-130.47)  216.50                80
 01/02/2019   09:49:38   (  -0.04,-128.55) (  -0.60,-125.93)  298.53                80
 01/03/2019   22:08:54   (   0.05,-128.41) (  -0.56,-131.24)  321.74                80
 01/04/2019   21:52:49   (   0.04,-128.39) (   0.43,-126.70)  193.19                80