Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/13/2021   09:43:10   (  -0.04,-127.90) (  -0.84,-124.35)  404.03                80
 07/14/2021   22:02:27   (   0.06,-127.76) (  -0.35,-129.66)  215.88                80
 07/15/2021   21:46:22   (   0.05,-127.72) (   0.63,-125.12)  296.58                80
 07/17/2021   10:05:32   (  -0.07,-127.75) (   0.52,-130.40)  302.38                80
 07/18/2021   09:49:27   (  -0.06,-127.70) (  -0.46,-125.86)  209.50                80
 07/19/2021   22:08:45   (   0.09,-127.56) (  -0.73,-131.17)  412.01                80
 07/20/2021   21:52:40   (   0.08,-127.51) (   0.26,-126.63)   99.46                80
 07/23/2021   09:53:05   (  -0.09,-127.47) (  -0.09,-127.38)   10.72                80
 07/25/2021   21:56:18   (   0.10,-127.27) (  -0.11,-128.15)  100.87                80
 07/26/2021   21:40:13   (   0.09,-127.22) (   0.88,-123.61)  410.42                80