Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 5 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/22/2019   22:02:14   (  -0.03,-128.44) (  -0.30,-129.62)  134.64                80
 05/23/2019   21:46:10   (  -0.04,-128.44) (   0.70,-125.08)  382.37                80
 05/25/2019   10:05:19   (   0.03,-128.44) (   0.44,-130.37)  218.99                80
 05/26/2019   09:49:15   (   0.04,-128.44) (  -0.55,-125.83)  297.60                80
 05/27/2019   22:08:32   (  -0.02,-128.45) (  -0.61,-131.14)  306.70                80
 05/28/2019   21:52:27   (  -0.03,-128.45) (   0.39,-126.61)  209.97                80
 05/30/2019   10:11:36   (   0.01,-128.45) (   0.81,-131.88)  391.53                80
 05/31/2019   09:55:32   (   0.02,-128.44) (  -0.24,-127.36)  124.51                80
 06/01/2019   22:14:48   (  -0.00,-128.43) (  -0.97,-132.65)  481.51                80
 06/02/2019   21:58:45   (  -0.01,-128.43) (   0.09,-128.13)   34.42                80