Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 1.  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   10:00:32   (   0.02,-128.13) (   0.22,-129.01)  100.39                80
 12/04/2021   09:44:25   (   0.04,-128.10) (  -0.75,-124.46)  413.62                80
 12/05/2021   22:03:41   (  -0.01,-128.06) (  -0.40,-129.77)  195.01                80
 12/06/2021   21:47:35   (  -0.03,-128.03) (   0.62,-125.24)  318.72                80
 12/08/2021   10:06:42   (   0.00,-127.98) (   0.54,-130.51)  288.09                80
 12/09/2021   09:50:35   (   0.01,-127.94) (  -0.43,-125.97)  225.42                80
 12/10/2021   22:09:50   (   0.01,-127.90) (  -0.72,-131.27)  383.76                80
 12/11/2021   21:53:44   (   0.00,-127.87) (   0.25,-126.73)  129.94                80
 12/13/2021   10:12:50   (  -0.03,-127.82) (   0.91,-132.00)  476.45                80
 12/14/2021   09:56:44   (  -0.01,-127.78) (  -0.06,-127.45)   37.06                80