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)
 12/21/2019   22:08:17   (   0.04,-128.04) (  -0.65,-131.09)  348.58                80
 12/22/2019   21:52:11   (   0.03,-128.06) (   0.35,-126.56)  171.43                80
 12/24/2019   10:11:18   (  -0.04,-128.14) (   0.78,-131.83)  420.50                80
 12/25/2019   09:55:13   (  -0.03,-128.17) (  -0.22,-127.30)   99.27                80
 12/27/2019   21:55:43   (   0.03,-128.20) (   0.04,-128.06)   14.75                80
 12/30/2019   09:58:45   (  -0.03,-128.29) (   0.09,-128.80)   58.86                80
 12/31/2019   09:42:39   (  -0.03,-128.31) (  -0.91,-124.27)  460.47                80
 01/01/2020   22:01:54   (   0.04,-128.31) (  -0.27,-129.57)  144.03                80
 01/02/2020   21:45:49   (   0.03,-128.33) (   0.74,-125.04)  375.08                80