Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/30/2018   10:20:46   (   0.09,-135.48) (  -0.30,-133.67)  205.90                80
 05/01/2018   22:40:03   (  -0.09,-135.50) (  -0.84,-138.98)  396.27                80
 05/02/2018   22:23:59   (  -0.09,-135.50) (   0.18,-134.45)  120.52                80
 05/04/2018   10:43:06   (   0.08,-135.49) (   1.05,-139.71)  482.11                80
 05/05/2018   10:27:02   (   0.09,-135.48) (   0.04,-135.18)   34.32                80
 05/07/2018   22:27:34   (  -0.09,-135.49) (  -0.21,-135.95)   52.88                80
 05/08/2018   22:11:29   (  -0.09,-135.49) (   0.80,-131.42)  463.20                80
 05/10/2018   10:30:37   (   0.08,-135.46) (   0.37,-136.69)  140.57                80
 05/11/2018   10:14:33   (   0.09,-135.45) (  -0.65,-132.16)  375.08                80
 05/12/2018   22:33:49   (  -0.08,-135.45) (  -0.53,-137.46)  229.47                80