Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 4 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)
 04/19/2015   22:22:56   (  -0.05,-135.20) (   0.46,-132.87)  264.78                80
 04/21/2015   10:44:41   (   0.05,-135.27) (   0.71,-138.14)  327.00                80
 04/22/2015   10:23:15   (   0.05,-135.29) (  -0.30,-133.60)  192.15                80
 04/23/2015   22:45:08   (  -0.06,-135.28) (  -0.89,-138.90)  412.78                80
 04/24/2015   22:29:02   (  -0.06,-135.30) (   0.13,-134.37)  106.35                80
 04/26/2015   10:50:47   (   0.06,-135.37) (   1.03,-139.63)  485.84                80
 04/27/2015   10:29:20   (   0.07,-135.39) (   0.02,-135.10)   32.97                80
 04/29/2015   22:32:27   (  -0.07,-135.39) (  -0.17,-135.86)   54.21                80
 04/30/2015   22:16:21   (  -0.07,-135.40) (   0.85,-131.33)  464.30                80
 05/02/2015   10:38:06   (   0.07,-135.46) (   0.30,-136.60)  128.89                80