Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 7 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/19/2020   10:14:00   (   0.02,-128.41) (   0.76,-131.80)  385.89                80
 07/20/2020   09:52:36   (   0.02,-128.41) (  -0.23,-127.27)  130.32                80
 07/21/2020   22:14:33   (  -0.02,-128.37) (  -0.95,-132.58)  479.67                80
 07/22/2020   21:58:29   (  -0.02,-128.37) (   0.03,-128.04)   36.70                80
 07/25/2020   10:01:34   (   0.03,-128.41) (   0.11,-128.79)   42.71                80
 07/26/2020   09:40:09   (   0.03,-128.41) (  -0.88,-124.25)  473.09                80
 07/27/2020   22:02:06   (  -0.03,-128.35) (  -0.30,-129.56)  137.99                80
 07/28/2020   21:46:03   (  -0.02,-128.34) (   0.75,-125.04)  377.51                80
 07/30/2020   10:07:51   (  -0.02,-128.38) (   0.44,-130.31)  219.88                80
 07/31/2020   09:46:28   (  -0.01,-128.37) (  -0.60,-125.78)  295.29                80