Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 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)
 06/12/2021   22:02:01   (  -0.04,-128.43) (  -0.32,-129.59)  132.46                80
 06/13/2021   21:45:58   (  -0.05,-128.43) (   0.73,-125.07)  383.42                80
 06/15/2021   10:07:46   (   0.04,-128.49) (   0.48,-130.33)  210.49                80
 06/16/2021   09:46:23   (   0.05,-128.48) (  -0.57,-125.81)  304.87                80
 06/17/2021   22:08:19   (  -0.04,-128.39) (  -0.67,-131.11)  310.17                80
 06/18/2021   21:52:15   (  -0.05,-128.38) (   0.38,-126.58)  205.25                80
 06/20/2021   10:11:24   (   0.04,-128.44) (   0.83,-131.85)  388.99                80
 06/21/2021   09:55:20   (   0.04,-128.43) (  -0.22,-127.33)  125.65                80
 06/22/2021   22:14:36   (  -0.03,-128.31) (  -1.01,-132.62)  491.38                80
 06/23/2021   21:58:33   (  -0.03,-128.30) (   0.04,-128.10)   23.21                80