Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/21/2018   22:17:52   (   0.05,-134.79) (   0.46,-132.97)  207.56                80
 01/23/2018   10:39:39   (  -0.05,-134.89) (   0.70,-138.24)  381.77                80
 01/24/2018   10:18:13   (  -0.05,-134.93) (  -0.31,-133.71)  139.18                80
 01/25/2018   22:42:49   (   0.04,-134.95) (  -0.87,-139.01)  462.90                80
 01/26/2018   22:21:23   (   0.04,-134.98) (   0.13,-134.47)   57.58                80
 01/29/2018   10:24:25   (  -0.03,-135.10) (   0.01,-135.21)   13.44                80
 01/31/2018   22:30:15   (   0.03,-135.13) (  -0.18,-135.98)   97.19                80
 02/01/2018   22:08:49   (   0.03,-135.15) (   0.83,-131.44)  422.48                80
 02/03/2018   10:33:17   (  -0.02,-135.23) (   0.32,-136.71)  169.13                80
 02/04/2018   10:11:51   (  -0.02,-135.26) (  -0.69,-132.18)  350.31                80