Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 6 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/11/2019   09:49:22   (  -0.01,-128.35) (  -0.59,-125.85)  284.57                80
 06/12/2019   22:08:38   (   0.03,-128.33) (  -0.63,-131.15)  322.77                80
 06/13/2019   21:52:35   (   0.02,-128.31) (   0.43,-126.63)  192.35                80
 06/15/2019   10:11:43   (  -0.05,-128.29) (   0.76,-131.90)  411.28                80
 06/16/2019   09:55:39   (  -0.04,-128.27) (  -0.24,-127.37)  103.20                80
 06/18/2019   21:58:51   (   0.05,-128.22) (   0.09,-128.15)    9.14                80
 06/21/2019   09:59:15   (  -0.06,-128.18) (   0.10,-128.88)   80.60                80
 06/22/2019   09:43:11   (  -0.05,-128.15) (  -0.90,-124.35)  433.50                80
 06/23/2019   22:02:28   (   0.07,-128.11) (  -0.25,-129.66)  176.17                80
 06/24/2019   21:46:23   (   0.06,-128.09) (   0.70,-125.12)  338.10                80