Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/23/2017   10:24:57   (   0.29,-135.41) (   0.22,-135.16)   28.62                80
 09/25/2017   22:28:10   (  -0.28,-135.38) (  -0.40,-135.93)   62.85                80
 09/26/2017   22:12:05   (  -0.29,-135.39) (   0.58,-131.40)  454.58                80
 09/28/2017   10:33:55   (   0.27,-135.45) (   0.56,-136.67)  139.98                80
 09/29/2017   10:12:31   (   0.28,-135.45) (  -0.49,-132.15)  376.48                80
 09/30/2017   22:34:27   (  -0.26,-135.39) (  -0.75,-137.45)  234.60                80
 10/01/2017   22:18:24   (  -0.26,-135.40) (   0.30,-132.93)  282.14                80
 10/03/2017   10:40:13   (   0.24,-135.46) (   0.84,-138.20)  312.38                80
 10/04/2017   10:18:49   (   0.25,-135.45) (  -0.15,-133.67)  203.52                80
 10/05/2017   22:40:46   (  -0.23,-135.38) (  -1.02,-138.98)  409.65                80