Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 1 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/07/2019   09:55:52   (  -0.05,-128.44) (  -0.29,-127.44)  114.79                80
 01/09/2019   21:59:02   (   0.05,-128.28) (   0.05,-128.19)    9.30                80
 01/12/2019   09:59:24   (  -0.06,-128.31) (   0.10,-128.93)   71.09                80
 01/13/2019   09:43:20   (  -0.05,-128.29) (  -0.94,-124.41)  442.54                80
 01/14/2019   22:02:35   (   0.06,-128.14) (  -0.27,-129.71)  178.02                80
 01/15/2019   21:46:30   (   0.05,-128.11) (   0.71,-125.17)  335.27                80
 01/17/2019   10:05:37   (  -0.06,-128.16) (   0.48,-130.43)  259.84                80
 01/18/2019   09:49:33   (  -0.05,-128.13) (  -0.56,-125.91)  252.96                80
 01/19/2019   22:08:48   (   0.05,-127.96) (  -0.64,-131.21)  368.94                80