Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 20.  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   22:17:51   (   0.05,-134.79) (   0.45,-132.97)  207.63                80
 01/23/2018   10:39:39   (  -0.05,-134.89) (   0.71,-138.24)  381.86                80
 01/24/2018   10:18:13   (  -0.05,-134.93) (  -0.29,-133.70)  139.08                80
 01/25/2018   22:42:48   (   0.04,-134.95) (  -0.88,-139.01)  462.95                80
 01/26/2018   22:24:04   (   0.04,-134.98) (   0.18,-134.48)   57.55                80
 01/29/2018   10:27:06   (  -0.03,-135.09) (  -0.03,-135.22)   13.91                80
 01/31/2018   22:30:16   (   0.03,-135.13) (  -0.14,-135.99)   97.44                80
 02/01/2018   22:08:50   (   0.03,-135.15) (   0.87,-131.45)  422.21                80
 02/03/2018   10:33:16   (  -0.02,-135.23) (   0.34,-136.71)  169.58                80