Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/03/2021   10:00:31   (   0.02,-128.13) (   0.25,-129.00)  100.23                80
 12/04/2021   09:44:26   (   0.04,-128.10) (  -0.78,-124.47)  413.91                80
 12/05/2021   22:03:41   (  -0.01,-128.07) (  -0.37,-129.78)  194.55                80
 12/06/2021   21:47:35   (  -0.03,-128.04) (   0.60,-125.23)  319.28                80
 12/08/2021   10:06:41   (   0.00,-127.98) (   0.56,-130.50)  287.39                80
 12/09/2021   09:50:35   (   0.01,-127.95) (  -0.41,-125.96)  226.22                80
 12/10/2021   22:09:50   (   0.01,-127.91) (  -0.74,-131.27)  382.76                80
 12/11/2021   21:53:44   (   0.00,-127.88) (   0.29,-126.74)  131.06                80
 12/13/2021   10:12:50   (  -0.02,-127.83) (   0.93,-131.99)  475.28                80
 12/14/2021   09:56:44   (  -0.01,-127.79) (  -0.10,-127.46)   38.26                80
 12/16/2021   21:57:13   (   0.02,-127.71) (  -0.07,-128.23)   58.08                80