Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/10/2021   21:56:32   (   0.19,-128.05) (   0.15,-128.23)   19.77                80
 08/11/2021   21:40:28   (   0.18,-128.07) (   1.14,-123.69)  498.58                80
 08/13/2021   09:59:37   (  -0.20,-128.19) (  -0.01,-128.97)   89.61                80
 08/14/2021   09:43:34   (  -0.19,-128.21) (  -1.05,-124.45)  428.48                80
 08/15/2021   22:02:51   (   0.22,-128.13) (  -0.13,-129.76)  185.01                80
 08/16/2021   21:46:47   (   0.21,-128.14) (   0.86,-125.22)  332.32                80
 08/18/2021   10:05:56   (  -0.23,-128.24) (   0.27,-130.50)  257.71                80
 08/19/2021   09:49:51   (  -0.23,-128.25) (  -0.72,-125.97)  259.45                80
 08/20/2021   22:09:09   (   0.25,-128.17) (  -0.47,-131.27)  354.63                80
 08/21/2021   21:53:05   (   0.24,-128.17) (   0.59,-126.75)  162.34                80