Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2017   10:31:06   (  -0.03,-135.44) (   0.27,-136.81)  156.18                80
 12/18/2017   10:15:01   (  -0.02,-135.43) (  -0.72,-132.28)  359.90                80
 12/19/2017   22:34:16   (   0.03,-135.35) (  -0.48,-137.57)  254.07                80
 12/20/2017   22:18:11   (   0.02,-135.34) (   0.51,-133.04)  261.55                80
 12/22/2017   10:37:19   (  -0.04,-135.39) (   0.60,-138.32)  333.25                80
 12/23/2017   10:21:14   (  -0.03,-135.38) (  -0.39,-133.78)  182.11                80
 12/24/2017   22:40:29   (   0.04,-135.29) (  -0.81,-139.08)  432.59                80
 12/25/2017   22:24:23   (   0.04,-135.27) (   0.18,-134.55)   82.31                80
 12/28/2017   10:27:26   (  -0.04,-135.29) (  -0.06,-135.29)    2.31                80