Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 11 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 11/01/2017   22:34:27   (  -0.11,-134.72) (  -0.73,-137.52)  318.78                80
 11/02/2017   22:18:21   (  -0.13,-134.68) (   0.25,-132.98)  193.56                80
 11/04/2017   10:37:30   (   0.10,-134.69) (   0.88,-138.26)  406.30                80
 11/05/2017   10:21:24   (   0.11,-134.64) (  -0.10,-133.72)  105.05                80
 11/07/2017   22:21:55   (  -0.10,-134.43) (  -0.12,-134.49)    6.33                80
 11/10/2017   10:24:58   (   0.09,-134.38) (   0.26,-135.23)   96.42                80
 11/11/2017   10:08:52   (   0.10,-134.33) (  -0.71,-130.69)  414.04                80
 11/12/2017   22:28:09   (  -0.07,-134.16) (  -0.47,-136.00)  209.97                80
 11/13/2017   22:12:03   (  -0.08,-134.10) (   0.51,-131.46)  300.81                80
 11/15/2017   10:31:10   (   0.06,-134.11) (   0.67,-136.73)  299.84                80