Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 9 12.  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)  166.48                80
 09/14/2020   21:43:44   (   0.10,-128.16) (   0.79,-125.07)  352.15                80
 09/16/2020   10:05:32   (  -0.11,-128.23) (   0.38,-130.34)  240.68                80
 09/17/2020   09:49:28   (  -0.11,-128.25) (  -0.68,-125.82)  277.97                80
 09/18/2020   22:11:25   (   0.11,-128.24) (  -0.53,-131.12)  327.62                80
 09/19/2020   21:50:00   (   0.11,-128.26) (   0.47,-126.59)  190.59                80
 09/21/2020   10:11:48   (  -0.11,-128.32) (   0.70,-131.86)  403.38                80
 09/22/2020   09:55:44   (  -0.11,-128.33) (  -0.31,-127.32)  114.58                80
 09/23/2020   22:17:41   (   0.12,-128.32) (  -0.84,-132.63)  491.89                80
 09/24/2020   21:56:17   (   0.12,-128.33) (   0.17,-128.10)   25.46                80