Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 3 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)
 03/11/2021   10:07:33   (  -0.12,-128.36) (   0.35,-130.35)  228.04                80
 03/12/2021   09:46:09   (  -0.12,-128.36) (  -0.69,-125.83)  288.91                80
 03/13/2021   22:08:05   (   0.11,-128.41) (  -0.48,-131.13)  309.71                80
 03/14/2021   21:52:00   (   0.12,-128.42) (   0.50,-126.59)  207.78                80
 03/16/2021   10:13:47   (  -0.11,-128.40) (   0.69,-131.86)  394.59                80
 03/17/2021   09:52:23   (  -0.12,-128.40) (  -0.35,-127.33)  121.92                80
 03/18/2021   22:14:18   (   0.10,-128.43) (  -0.87,-132.63)  478.54                80
 03/19/2021   21:58:13   (   0.11,-128.44) (   0.17,-128.10)   38.26                80
 03/22/2021   10:01:16   (  -0.09,-128.41) (  -0.03,-128.84)   48.53                80
 03/23/2021   09:39:51   (  -0.10,-128.40) (  -1.01,-124.30)  467.13                80
 03/24/2021   22:01:46   (   0.08,-128.42) (  -0.21,-129.60)  135.18                80