Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2018   22:08:57   (   0.03,-128.56) (  -0.59,-131.22)  303.79                80
 12/19/2018   21:52:53   (   0.02,-128.56) (   0.44,-126.70)  212.84                80
 12/21/2018   10:12:01   (  -0.03,-128.67) (   0.68,-131.98)  376.36                80
 12/22/2018   09:55:55   (  -0.02,-128.66) (  -0.29,-127.44)  139.43                80
 12/23/2018   22:15:12   (   0.04,-128.53) (  -0.89,-132.74)  479.83                80
 12/24/2018   21:59:06   (   0.03,-128.52) (   0.09,-128.20)   35.74                80
 12/27/2018   09:59:29   (  -0.03,-128.61) (   0.06,-128.95)   39.12                80
 12/28/2018   09:43:25   (  -0.03,-128.59) (  -0.97,-124.42)  476.05                80
 12/29/2018   22:02:40   (   0.04,-128.46) (  -0.25,-129.72)  143.96                80
 12/30/2018   21:46:35   (   0.03,-128.44) (   0.78,-125.19)  371.29                80