Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2018   09:59:31   (   0.01,-128.65) (   0.07,-128.93)   32.66                80
 12/12/2018   09:43:27   (   0.02,-128.65) (  -0.96,-124.41)  484.34                80
 12/13/2018   22:02:43   (   0.01,-128.55) (  -0.23,-129.71)  131.97                80
 12/14/2018   21:46:38   (  -0.00,-128.56) (   0.74,-125.17)  385.18                80
 12/16/2018   10:05:46   (  -0.02,-128.67) (   0.39,-130.45)  203.41                80
 12/17/2018   09:49:42   (  -0.01,-128.67) (  -0.64,-125.93)  313.19                80
 12/18/2018   22:08:57   (   0.03,-128.56) (  -0.60,-131.22)  304.47                80
 12/19/2018   21:52:52   (   0.01,-128.55) (   0.43,-126.69)  211.99                80
 12/21/2018   10:12:01   (  -0.03,-128.66) (   0.70,-131.98)  377.32                80
 12/22/2018   09:55:55   (  -0.02,-128.65) (  -0.28,-127.44)  138.35                80
 12/23/2018   22:15:12   (   0.03,-128.52) (  -0.90,-132.74)  481.14                80