Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 9 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/13/2020   22:05:08   (   0.10,-128.14) (  -0.22,-129.60)  166.36                80
 09/14/2020   21:43:43   (   0.10,-128.16) (   0.78,-125.07)  352.34                80
 09/16/2020   10:05:32   (  -0.11,-128.23) (   0.39,-130.34)  240.42                80
 09/17/2020   09:49:28   (  -0.11,-128.26) (  -0.67,-125.82)  278.29                80
 09/18/2020   22:11:25   (   0.11,-128.25) (  -0.54,-131.12)  327.17                80
 09/19/2020   21:50:00   (   0.11,-128.26) (   0.47,-126.58)  191.10                80
 09/21/2020   10:11:48   (  -0.11,-128.33) (   0.71,-131.85)  402.81                80
 09/22/2020   09:55:45   (  -0.11,-128.34) (  -0.36,-127.33)  115.19                80
 09/23/2020   22:17:41   (   0.12,-128.32) (  -0.85,-132.63)  491.13                80
 09/24/2020   21:56:17   (   0.12,-128.33) (   0.16,-128.10)   26.31                80
 09/27/2020   09:59:22   (  -0.13,-128.39) (  -0.05,-128.85)   51.49                80