Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 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)
 03/20/2018   22:27:21   (  -0.06,-134.86) (  -0.26,-135.91)  118.97                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.74,-131.38)  392.96                80
 03/23/2018   10:33:04   (   0.06,-134.75) (   0.49,-136.64)  215.47                80
 03/24/2018   10:11:39   (   0.06,-134.70) (  -0.51,-132.11)  295.84                80
 03/25/2018   22:33:37   (  -0.07,-134.64) (  -0.67,-137.41)  315.98                80
 03/26/2018   22:17:32   (  -0.07,-134.59) (   0.34,-132.88)  195.10                80
 03/28/2018   10:39:19   (   0.08,-134.51) (   0.89,-138.14)  414.26                80
 03/29/2018   10:17:55   (   0.07,-134.46) (  -0.11,-133.61)   96.55                80
 03/31/2018   22:23:47   (  -0.08,-134.33) (  -0.11,-134.37)    6.13                80