Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/16/2019   22:08:49   (  -0.34,-128.04) (  -0.99,-131.04)  341.17                80
 09/17/2019   21:52:43   (  -0.34,-128.02) (  -0.02,-126.50)  172.70                80
 09/19/2019   10:14:32   (   0.33,-128.00) (   1.17,-131.77)  429.79                80
 09/20/2019   09:53:06   (   0.34,-127.96) (   0.20,-127.23)   83.20                80
 09/22/2019   21:56:18   (  -0.33,-127.85) (  -0.35,-128.00)   17.58                80
 09/23/2019   21:40:12   (  -0.33,-127.81) (   0.62,-123.46)  495.12                80
 09/25/2019   09:59:21   (   0.31,-127.78) (   0.53,-128.73)  108.84                80
 09/26/2019   09:40:36   (   0.32,-127.74) (  -0.50,-124.21)  403.24                80
 09/27/2019   22:02:32   (  -0.30,-127.64) (  -0.73,-129.50)  211.81                80
 09/28/2019   21:46:27   (  -0.31,-127.60) (   0.30,-124.97)  300.62                80