Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2018   09:49:41   (  -0.01,-128.67) (  -0.62,-125.92)  313.49                80
 12/18/2018   22:08:57   (   0.03,-128.56) (  -0.57,-131.23)  303.91                80
 12/19/2018   21:52:52   (   0.02,-128.56) (   0.41,-126.69)  212.67                80
 12/21/2018   10:12:00   (  -0.03,-128.67) (   0.72,-131.97)  376.54                80
 12/22/2018   09:55:56   (  -0.02,-128.66) (  -0.31,-127.44)  139.23                80
 12/23/2018   22:15:11   (   0.03,-128.53) (  -0.92,-132.74)  480.16                80
 12/24/2018   21:59:07   (   0.03,-128.52) (   0.11,-128.21)   35.42                80
 12/27/2018   09:59:29   (  -0.03,-128.60) (   0.04,-128.95)   39.51                80
 12/28/2018   09:43:24   (  -0.03,-128.59) (  -0.94,-124.41)  475.56                80
 12/29/2018   22:02:40   (   0.04,-128.45) (  -0.23,-129.72)  144.55                80