Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/20/2018   22:36:37   (   0.05,-134.75) (  -0.56,-137.50)  313.84                80
 01/21/2018   22:17:51   (   0.05,-134.79) (   0.44,-132.97)  207.44                80
 01/23/2018   10:39:39   (  -0.05,-134.89) (   0.71,-138.24)  382.01                80
 01/24/2018   10:18:13   (  -0.05,-134.93) (  -0.29,-133.70)  138.90                80
 01/25/2018   22:42:48   (   0.04,-134.94) (  -0.89,-139.00)  463.34                80
 01/26/2018   22:24:04   (   0.04,-134.98) (   0.17,-134.48)   57.08                80
 01/29/2018   10:27:06   (  -0.03,-135.09) (  -0.03,-135.22)   14.25                80
 01/31/2018   22:30:16   (   0.03,-135.12) (  -0.14,-135.99)   98.14                80
 02/01/2018   22:08:50   (   0.03,-135.15) (   0.86,-131.45)  421.42                80