Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 10 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/18/2021   22:03:13   (  -0.24,-128.22) (  -0.58,-129.68)  166.63                80
 10/19/2021   21:47:09   (  -0.25,-128.24) (   0.42,-125.15)  352.12                80
 10/21/2021   10:06:21   (   0.22,-128.29) (   0.70,-130.44)  244.58                80
 10/22/2021   09:50:17   (   0.24,-128.31) (  -0.29,-125.91)  273.77                80
 10/23/2021   22:09:36   (  -0.21,-128.32) (  -0.84,-131.23)  330.88                80
 10/24/2021   21:53:33   (  -0.22,-128.34) (   0.15,-126.70)  187.09                80
 10/26/2021   10:12:43   (   0.19,-128.38) (   1.02,-131.98)  410.83                80
 10/27/2021   09:56:41   (   0.20,-128.39) (  -0.03,-127.46)  106.71                80
 10/28/2021   22:15:59   (  -0.17,-128.39) (  -1.16,-132.77)  499.25                80
 10/29/2021   21:59:56   (  -0.18,-128.40) (  -0.16,-128.24)   18.07                80