Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2020   09:59:15   (  -0.09,-128.12) (   0.05,-128.83)   80.27                80
 09/12/2020   09:43:11   (  -0.09,-128.14) (  -0.95,-124.30)  438.69                80
 09/13/2020   22:05:08   (   0.10,-128.14) (  -0.21,-129.60)  166.93                80
 09/14/2020   21:43:44   (   0.10,-128.16) (   0.80,-125.07)  351.61                80
 09/16/2020   10:05:32   (  -0.11,-128.23) (   0.38,-130.34)  241.25                80
 09/17/2020   09:49:28   (  -0.11,-128.25) (  -0.63,-125.81)  277.27                80
 09/18/2020   22:11:25   (   0.11,-128.23) (  -0.52,-131.12)  328.63                80
 09/19/2020   21:50:00   (   0.11,-128.25) (   0.48,-126.59)  189.47                80
 09/21/2020   10:11:49   (  -0.11,-128.31) (   0.69,-131.86)  404.53                80
 09/22/2020   09:55:44   (  -0.11,-128.32) (  -0.31,-127.33)  113.30                80
 09/23/2020   22:17:41   (   0.12,-128.30) (  -0.83,-132.64)  493.48                80