Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 8 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/11/2021   21:40:29   (   0.18,-128.08) (   1.17,-123.70)  499.00                80
 08/13/2021   09:59:38   (  -0.20,-128.20) (  -0.03,-128.98)   88.86                80
 08/14/2021   09:43:33   (  -0.19,-128.21) (  -1.02,-124.44)  429.32                80
 08/15/2021   22:02:51   (   0.22,-128.14) (  -0.17,-129.75)  184.08                80
 08/16/2021   21:46:47   (   0.21,-128.15) (   0.88,-125.23)  333.39                80
 08/18/2021   10:05:56   (  -0.23,-128.25) (   0.25,-130.51)  256.34                80
 08/19/2021   09:49:52   (  -0.23,-128.26) (  -0.74,-125.97)  260.93                80
 08/20/2021   22:09:09   (   0.25,-128.18) (  -0.45,-131.28)  353.05                80
 08/21/2021   21:53:05   (   0.24,-128.19) (   0.54,-126.74)  164.02                80
 08/23/2021   10:12:14   (  -0.26,-128.29) (   0.59,-132.03)  426.28                80
 08/24/2021   09:56:10   (  -0.25,-128.30) (  -0.40,-127.49)   91.12                80