Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 15.  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) (   0.29,-136.81)  156.14                80
 12/18/2017   10:15:01   (  -0.02,-135.43) (  -0.70,-132.27)  359.97                80
 12/19/2017   22:34:17   (   0.03,-135.35) (  -0.44,-137.58)  254.00                80
 12/20/2017   22:18:11   (   0.02,-135.34) (   0.55,-133.05)  261.66                80
 12/22/2017   10:37:19   (  -0.03,-135.39) (   0.62,-138.32)  333.08                80
 12/23/2017   10:21:13   (  -0.03,-135.38) (  -0.37,-133.78)  182.32                80
 12/24/2017   22:40:29   (   0.04,-135.29) (  -0.83,-139.08)  432.37                80
 12/25/2017   22:24:24   (   0.04,-135.27) (   0.22,-134.55)   82.60                80
 12/28/2017   10:27:26   (  -0.04,-135.30) (  -0.04,-135.29)    1.16                80