Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/04/2021   10:13:53   (   0.06,-128.50) (   0.83,-131.82)  378.89                80
 06/05/2021   09:52:30   (   0.07,-128.51) (  -0.21,-127.30)  137.81                80
 06/06/2021   22:14:27   (  -0.06,-128.44) (  -0.98,-132.60)  474.14                80
 06/07/2021   21:58:23   (  -0.06,-128.45) (   0.00,-128.07)   42.70                80
 06/10/2021   10:01:29   (   0.05,-128.52) (   0.10,-128.82)   33.97                80
 06/11/2021   09:40:04   (   0.06,-128.52) (  -0.88,-124.29)  481.84                80
 06/12/2021   22:02:01   (  -0.05,-128.44) (  -0.30,-129.59)  131.93                80
 06/13/2021   21:45:57   (  -0.05,-128.43) (   0.69,-125.06)  384.01                80
 06/15/2021   10:07:46   (   0.05,-128.50) (   0.47,-130.34)  209.49                80
 06/16/2021   09:46:22   (   0.06,-128.49) (  -0.52,-125.80)  305.88                80
 06/17/2021   22:08:19   (  -0.05,-128.40) (  -0.66,-131.11)  309.34                80