Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/29/2018   10:27:06   (  -0.03,-135.11) (  -0.02,-135.22)   12.46                80
 01/31/2018   22:30:15   (   0.03,-135.14) (  -0.15,-135.98)   95.49                80
 02/01/2018   22:08:50   (   0.03,-135.17) (   0.85,-131.45)  424.41                80
 02/03/2018   10:33:17   (  -0.02,-135.25) (   0.29,-136.72)  166.93                80
 02/04/2018   10:11:52   (  -0.03,-135.28) (  -0.71,-132.18)  352.69                80
 02/05/2018   22:36:27   (   0.02,-135.28) (  -0.47,-137.49)  250.90                80
 02/06/2018   22:15:02   (   0.02,-135.31) (   0.54,-132.95)  268.57                80
 02/08/2018   10:39:29   (  -0.02,-135.38) (   0.60,-138.22)  323.38                80
 02/09/2018   10:18:03   (  -0.01,-135.40) (  -0.40,-133.69)  195.80                80
 02/10/2018   22:42:38   (  -0.01,-135.40) (  -0.83,-138.98)  408.57                80