Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/19/2021   22:08:45   (   0.09,-127.56) (  -0.73,-131.17)  411.01                80
 07/20/2021   21:52:41   (   0.09,-127.52) (   0.31,-126.64)  100.74                80
 07/22/2021   10:11:49   (  -0.11,-127.54) (   0.90,-131.91)  498.90                80
 07/23/2021   09:55:46   (  -0.10,-127.49) (  -0.14,-127.39)   12.54                80
 07/25/2021   21:56:19   (   0.11,-127.29) (  -0.07,-128.16)   98.44                80
 07/26/2021   21:40:14   (   0.10,-127.24) (   0.92,-123.62)  413.10                80
 07/28/2021   09:59:24   (  -0.12,-127.26) (   0.23,-128.90)  186.45                80
 07/29/2021   09:43:19   (  -0.11,-127.21) (  -0.75,-124.36)  324.93                80
 07/30/2021   22:02:36   (   0.13,-127.05) (  -0.44,-129.67)  297.72                80
 07/31/2021   21:46:32   (   0.12,-127.00) (   0.55,-125.13)  213.43                80