Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/21/2020   10:11:49   (  -0.11,-128.34) (   0.67,-131.86)  401.05                80
 09/22/2020   09:55:45   (  -0.11,-128.36) (  -0.34,-127.33)  117.12                80
 09/23/2020   22:17:41   (   0.12,-128.34) (  -0.87,-132.63)  489.50                80
 09/24/2020   21:56:17   (   0.12,-128.35) (   0.20,-128.11)   28.21                80
 09/27/2020   09:59:21   (  -0.13,-128.42) (  -0.03,-128.84)   48.40                80
 09/28/2020   09:43:17   (  -0.13,-128.43) (  -1.04,-124.31)  469.33                80
 09/29/2020   22:05:13   (   0.13,-128.41) (  -0.16,-129.61)  137.41                80
 09/30/2020   21:43:50   (   0.13,-128.42) (   0.91,-125.09)  380.10                80
 10/02/2020   10:05:38   (  -0.13,-128.47) (   0.27,-130.36)  214.56                80
 10/03/2020   09:49:33   (  -0.13,-128.48) (  -0.74,-125.83)  302.95                80