Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/24/2018   10:18:14   (  -0.05,-134.93) (  -0.35,-133.72)  139.37                80
 01/25/2018   22:42:48   (   0.04,-134.95) (  -0.89,-139.00)  462.65                80
 01/26/2018   22:24:04   (   0.04,-134.99) (   0.17,-134.48)   57.93                80
 01/29/2018   10:27:06   (  -0.03,-135.10) (  -0.02,-135.22)   12.75                80
 01/31/2018   22:30:15   (   0.03,-135.14) (  -0.15,-135.98)   96.37                80
 02/01/2018   22:08:50   (   0.03,-135.16) (   0.85,-131.45)  423.37                80
 02/03/2018   10:33:17   (  -0.02,-135.24) (   0.29,-136.72)  168.01                80
 02/04/2018   10:11:52   (  -0.02,-135.27) (  -0.71,-132.19)  351.49                80
 02/05/2018   22:36:27   (   0.02,-135.27) (  -0.46,-137.49)  252.47                80