Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/01/2021   10:05:20   (  -0.01,-128.26) (   0.50,-130.37)  241.54                80
 07/02/2021   09:49:17   (   0.00,-128.24) (  -0.54,-125.85)  272.31                80
 07/03/2021   22:08:34   (   0.02,-128.12) (  -0.66,-131.15)  345.53                80
 07/04/2021   21:52:29   (   0.01,-128.10) (   0.32,-126.62)  168.22                80
 07/06/2021   10:11:40   (  -0.03,-128.14) (   0.79,-131.90)  428.64                80
 07/07/2021   09:55:35   (  -0.02,-128.11) (  -0.19,-127.37)   84.45                80
 07/09/2021   21:56:08   (   0.03,-127.95) (  -0.02,-128.14)   22.20                80
 07/10/2021   21:40:05   (   0.02,-127.91) (   1.01,-123.61)  490.69                80
 07/12/2021   09:59:14   (  -0.04,-127.94) (   0.15,-128.89)  107.26                80
 07/13/2021   09:43:09   (  -0.03,-127.91) (  -0.83,-124.35)  405.20                80
 07/14/2021   22:02:27   (   0.05,-127.76) (  -0.36,-129.66)  215.48                80