Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 11 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 11/22/2017   22:40:40   (  -0.03,-135.06) (  -0.93,-139.07)  457.63                80
 11/23/2017   22:24:35   (  -0.04,-135.08) (   0.11,-134.55)   62.03                80
 11/26/2017   10:27:38   (   0.03,-135.25) (   0.02,-135.29)    5.39                80
 11/28/2017   22:28:09   (  -0.02,-135.20) (  -0.21,-136.06)   98.20                80
 11/29/2017   22:12:03   (  -0.03,-135.22) (   0.78,-131.53)  420.57                80
 12/01/2017   10:31:12   (   0.01,-135.34) (   0.34,-136.81)  166.97                80
 12/02/2017   10:15:06   (   0.02,-135.36) (  -0.65,-132.27)  351.27                80
 12/03/2017   22:34:23   (  -0.00,-135.28) (  -0.51,-137.58)  262.47                80
 12/04/2017   22:18:17   (  -0.01,-135.29) (   0.47,-133.04)  255.20                80