Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 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)
 01/23/2018   10:39:38   (  -0.05,-134.89) (   0.72,-138.24)  381.69                80
 01/24/2018   10:18:14   (  -0.05,-134.93) (  -0.34,-133.71)  139.32                80
 01/25/2018   22:42:49   (   0.04,-134.95) (  -0.84,-139.02)  462.75                80
 01/26/2018   22:24:04   (   0.04,-134.98) (   0.17,-134.48)   57.77                80
 01/29/2018   10:27:06   (  -0.03,-135.10) (  -0.02,-135.22)   13.02                80
 01/31/2018   22:30:15   (   0.03,-135.13) (  -0.15,-135.98)   96.76                80
 02/01/2018   22:08:50   (   0.03,-135.16) (   0.85,-131.45)  422.93                80
 02/03/2018   10:33:17   (  -0.02,-135.24) (   0.30,-136.72)  168.57                80
 02/04/2018   10:11:52   (  -0.02,-135.26) (  -0.71,-132.18)  350.89                80