Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 2 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)
 02/20/2018   10:11:39   (  -0.01,-135.44) (  -0.73,-132.14)  375.94                80
 02/21/2018   22:36:15   (   0.00,-135.42) (  -0.45,-137.44)  229.80                80
 02/22/2018   22:14:49   (   0.00,-135.42) (   0.56,-132.90)  286.58                80
 02/24/2018   10:39:16   (   0.00,-135.43) (   0.62,-138.17)  312.40                80
 02/25/2018   10:17:50   (   0.00,-135.42) (  -0.39,-133.63)  203.47                80
 02/26/2018   22:42:25   (  -0.01,-135.39) (  -0.79,-138.93)  403.79                80
 02/27/2018   22:21:00   (  -0.00,-135.38) (   0.22,-134.40)  111.76                80
 03/01/2018   10:45:26   (   0.01,-135.38) (   0.95,-139.66)  488.20                80
 03/02/2018   10:24:01   (   0.00,-135.36) (  -0.06,-135.13)   27.22                80
 03/04/2018   22:29:51   (  -0.00,-135.32) (  -0.10,-135.89)   65.37                80