Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 10.  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   21:56:33   (   0.19,-128.06) (   0.15,-128.23)   19.59                80
 08/11/2021   21:40:28   (   0.18,-128.07) (   1.14,-123.69)  498.80                80
 08/13/2021   09:59:37   (  -0.20,-128.19) (  -0.01,-128.97)   89.24                80
 08/14/2021   09:43:34   (  -0.19,-128.21) (  -1.06,-124.45)  428.90                80
 08/15/2021   22:02:51   (   0.22,-128.13) (  -0.13,-129.76)  184.55                80
 08/16/2021   21:46:47   (   0.21,-128.14) (   0.86,-125.22)  332.83                80
 08/18/2021   10:05:56   (  -0.23,-128.25) (   0.27,-130.50)  257.05                80
 08/19/2021   09:49:52   (  -0.23,-128.26) (  -0.72,-125.97)  260.15                80
 08/20/2021   22:09:09   (   0.25,-128.17) (  -0.47,-131.27)  353.91                80
 08/21/2021   21:53:05   (   0.24,-128.18) (   0.58,-126.75)  163.11                80
 08/23/2021   10:12:14   (  -0.26,-128.28) (   0.61,-132.02)  427.38                80