Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2021   09:59:38   (  -0.20,-128.20) (  -0.03,-128.98)   88.56                80
 08/14/2021   09:43:33   (  -0.19,-128.22) (  -1.02,-124.44)  429.72                80
 08/15/2021   22:02:51   (   0.22,-128.14) (  -0.17,-129.75)  183.65                80
 08/16/2021   21:46:47   (   0.21,-128.15) (   0.88,-125.23)  333.92                80
 08/18/2021   10:05:56   (  -0.23,-128.26) (   0.25,-130.51)  255.51                80
 08/19/2021   09:49:52   (  -0.23,-128.27) (  -0.74,-125.97)  261.86                80
 08/20/2021   22:09:09   (   0.25,-128.19) (  -0.44,-131.28)  352.12                80
 08/21/2021   21:53:05   (   0.24,-128.20) (   0.55,-126.74)  165.07                80
 08/23/2021   10:12:14   (  -0.26,-128.30) (   0.58,-132.03)  424.90                80
 08/24/2021   09:56:10   (  -0.25,-128.31) (  -0.41,-127.49)   92.58                80
 08/26/2021   21:56:42   (   0.26,-128.24) (   0.23,-128.26)    4.90                80