Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 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)
 07/18/2021   09:49:28   (  -0.07,-127.71) (  -0.48,-125.87)  210.32                80
 07/19/2021   22:08:45   (   0.09,-127.56) (  -0.71,-131.17)  411.01                80
 07/20/2021   21:52:40   (   0.08,-127.52) (   0.27,-126.64)  100.68                80
 07/22/2021   10:11:50   (  -0.11,-127.54) (   0.88,-131.91)  498.97                80
 07/23/2021   09:55:45   (  -0.10,-127.49) (  -0.10,-127.38)   12.54                80
 07/25/2021   21:56:18   (   0.11,-127.29) (  -0.10,-128.15)   98.54                80
 07/26/2021   21:40:14   (   0.10,-127.24) (   0.88,-123.61)  413.00                80
 07/28/2021   09:59:23   (  -0.12,-127.26) (   0.26,-128.89)  186.62                80
 07/29/2021   09:43:18   (  -0.11,-127.21) (  -0.72,-124.36)  324.78                80
 07/30/2021   22:02:36   (   0.13,-127.05) (  -0.46,-129.66)  297.86                80
 07/31/2021   21:46:31   (   0.12,-127.00) (   0.52,-125.13)  213.29                80