Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2019   09:49:01   (  -0.02,-128.03) (  -0.51,-125.79)  255.06                80
 12/21/2019   22:08:17   (   0.04,-128.04) (  -0.63,-131.10)  348.55                80
 12/22/2019   21:52:12   (   0.03,-128.06) (   0.38,-126.56)  171.50                80
 12/24/2019   10:11:18   (  -0.04,-128.14) (   0.82,-131.83)  420.27                80
 12/25/2019   09:55:13   (  -0.03,-128.17) (  -0.25,-127.30)   99.58                80
 12/27/2019   21:58:23   (   0.03,-128.20) (   0.06,-128.07)   14.80                80
 12/30/2019   09:58:45   (  -0.03,-128.29) (   0.07,-128.81)   58.44                80
 12/31/2019   09:42:40   (  -0.03,-128.32) (  -0.94,-124.28)  460.94                80
 01/01/2020   22:01:55   (   0.04,-128.32) (  -0.24,-129.58)  143.61                80
 01/02/2020   21:45:49   (   0.03,-128.34) (   0.77,-125.04)  375.49                80