Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/27/2021   22:01:50   (  -0.06,-128.36) (  -0.35,-129.55)  136.36                80
 05/28/2021   21:45:47   (  -0.06,-128.38) (   0.69,-125.03)  381.43                80
 05/30/2021   10:07:36   (   0.06,-128.46) (   0.46,-130.31)  210.02                80
 05/31/2021   09:46:11   (   0.07,-128.47) (  -0.53,-125.77)  307.17                80
 06/01/2021   22:08:09   (  -0.07,-128.42) (  -0.67,-131.08)  303.61                80
 06/02/2021   21:52:05   (  -0.07,-128.43) (   0.38,-126.56)  214.17                80
 06/04/2021   10:13:54   (   0.07,-128.52) (   0.83,-131.82)  376.46                80
 06/05/2021   09:52:30   (   0.07,-128.53) (  -0.21,-127.30)  140.62                80
 06/06/2021   22:14:27   (  -0.07,-128.46) (  -0.98,-132.61)  471.56                80
 06/07/2021   21:58:23   (  -0.07,-128.47) (   0.01,-128.07)   45.66                80