Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2018   10:05:46   (  -0.02,-128.67) (   0.38,-130.45)  203.21                80
 12/17/2018   09:49:42   (  -0.01,-128.67) (  -0.65,-125.93)  313.41                80
 12/18/2018   22:08:57   (   0.03,-128.56) (  -0.59,-131.22)  304.20                80
 12/19/2018   21:52:52   (   0.01,-128.56) (   0.44,-126.69)  212.30                80
 12/21/2018   10:12:01   (  -0.03,-128.66) (   0.69,-131.98)  376.94                80
 12/22/2018   09:55:55   (  -0.02,-128.66) (  -0.28,-127.44)  138.76                80
 12/23/2018   22:15:12   (   0.03,-128.52) (  -0.89,-132.74)  480.76                80
 12/24/2018   21:59:06   (   0.03,-128.51) (   0.08,-128.20)   34.70                80
 12/27/2018   09:59:29   (  -0.03,-128.60) (   0.07,-128.95)   40.43                80
 12/28/2018   09:43:24   (  -0.03,-128.58) (  -0.96,-124.42)  474.68                80