Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 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)
 09/17/2019   21:52:44   (  -0.34,-128.02) (   0.02,-126.51)  172.87                80
 09/19/2019   10:14:31   (   0.33,-128.00) (   1.18,-131.77)  429.77                80
 09/20/2019   09:53:07   (   0.34,-127.96) (   0.16,-127.24)   83.20                80
 09/22/2019   21:56:18   (  -0.33,-127.85) (  -0.37,-128.00)   17.31                80
 09/23/2019   21:40:13   (  -0.33,-127.81) (   0.66,-123.47)  495.38                80
 09/25/2019   09:59:20   (   0.31,-127.78) (   0.54,-128.73)  108.73                80
 09/26/2019   09:40:36   (   0.32,-127.74) (  -0.48,-124.20)  403.37                80
 09/27/2019   22:02:31   (  -0.30,-127.64) (  -0.74,-129.49)  211.50                80
 09/28/2019   21:46:27   (  -0.31,-127.60) (   0.29,-124.96)  300.96                80
 09/30/2019   10:05:35   (   0.29,-127.58) (   0.86,-130.24)  302.78                80