Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 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)
 04/16/2018   22:21:15   (  -0.09,-135.31) (   0.12,-134.44)   99.82                80
 04/18/2018   10:43:04   (   0.09,-135.33) (   1.04,-139.71)  498.29                80
 04/19/2018   10:26:59   (   0.09,-135.35) (   0.03,-135.18)   20.28                80
 04/21/2018   22:27:31   (  -0.09,-135.40) (  -0.23,-135.95)   62.87                80
 04/22/2018   22:11:27   (  -0.10,-135.41) (   0.78,-131.42)  454.97                80
 04/24/2018   10:30:35   (   0.10,-135.42) (   0.39,-136.69)  144.75                80
 04/25/2018   10:14:30   (   0.10,-135.43) (  -0.62,-132.16)  372.98                80
 04/26/2018   22:33:47   (  -0.10,-135.46) (  -0.57,-137.46)  228.75                80
 04/27/2018   22:17:42   (  -0.10,-135.47) (   0.44,-132.93)  288.79                80
 04/29/2018   10:36:50   (   0.09,-135.47) (   0.73,-138.20)  311.79                80