Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2019   22:02:34   (  -0.35,-128.16) (  -0.66,-129.53)  156.37                80
 09/12/2019   21:46:29   (  -0.35,-128.14) (   0.36,-125.01)  357.87                80
 09/14/2019   10:08:17   (   0.34,-128.13) (   0.84,-130.27)  243.55                80
 09/15/2019   09:46:52   (   0.35,-128.11) (  -0.18,-125.74)  270.13                80
 09/16/2019   22:08:49   (  -0.34,-128.04) (  -1.00,-131.04)  342.00                80
 09/17/2019   21:52:43   (  -0.34,-128.01) (  -0.03,-126.50)  171.85                80
 09/19/2019   10:14:31   (   0.33,-128.00) (   1.18,-131.77)  429.85                80
 09/20/2019   09:53:07   (   0.34,-127.97) (   0.15,-127.24)   83.11                80
 09/22/2019   21:56:18   (  -0.32,-127.84) (  -0.36,-128.00)   18.55                80
 09/23/2019   21:40:13   (  -0.33,-127.80) (   0.67,-123.47)  494.08                80
 09/25/2019   09:59:21   (   0.31,-127.78) (   0.54,-128.73)  109.11                80