Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/06/2021   21:53:02   (  -0.43,-128.19) (  -0.05,-126.62)  179.16                80
 09/08/2021   10:12:11   (   0.42,-128.22) (   1.22,-131.89)  417.30                80
 09/09/2021   09:56:06   (   0.42,-128.21) (   0.22,-127.36)   97.97                80
 09/11/2021   21:59:19   (  -0.42,-128.13) (  -0.40,-128.13)    1.70                80
 09/14/2021   09:59:43   (   0.41,-128.13) (   0.58,-128.87)   83.91                80
 09/15/2021   09:43:38   (   0.41,-128.11) (  -0.42,-124.33)  430.23                80
 09/16/2021   22:02:56   (  -0.39,-128.03) (  -0.75,-129.64)  183.90                80
 09/17/2021   21:46:51   (  -0.39,-128.00) (   0.25,-125.11)  330.07                80
 09/19/2021   10:05:59   (   0.38,-128.02) (   0.92,-130.38)  269.09                80