Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 11 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 11/22/2018   21:59:07   (  -0.07,-128.24) (  -0.06,-128.14)   10.36                80
 11/25/2018   09:59:31   (   0.07,-128.40) (   0.17,-128.90)   56.65                80
 11/26/2018   09:43:26   (   0.08,-128.42) (  -0.86,-124.37)  461.85                80
 11/27/2018   22:02:43   (  -0.05,-128.34) (  -0.34,-129.67)  152.02                80
 11/28/2018   21:46:38   (  -0.06,-128.36) (   0.68,-125.15)  366.71                80
 11/30/2018   10:05:46   (   0.04,-128.50) (   0.45,-130.43)  219.83                80
 12/01/2018   09:49:41   (   0.05,-128.51) (  -0.51,-125.89)  298.36                80
 12/02/2018   22:08:58   (  -0.02,-128.42) (  -0.62,-131.21)  316.79                80
 12/03/2018   21:52:53   (  -0.03,-128.44) (   0.35,-126.66)  201.75                80
 12/05/2018   10:12:01   (   0.01,-128.58) (   0.79,-131.95)  384.26                80