Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/17/2021   10:05:32   (  -0.08,-127.75) (   0.49,-130.40)  301.78                80
 07/18/2021   09:49:28   (  -0.07,-127.71) (  -0.49,-125.87)  210.28                80
 07/19/2021   22:08:45   (   0.09,-127.56) (  -0.70,-131.17)  411.10                80
 07/20/2021   21:52:41   (   0.08,-127.52) (   0.28,-126.64)  100.54                80
 07/22/2021   10:11:50   (  -0.11,-127.54) (   0.87,-131.92)  499.22                80
 07/23/2021   09:55:45   (  -0.10,-127.49) (  -0.11,-127.38)   12.17                80
 07/25/2021   21:56:18   (   0.11,-127.28) (  -0.10,-128.15)   98.92                80
 07/26/2021   21:40:14   (   0.10,-127.24) (   0.88,-123.61)  412.56                80
 07/28/2021   09:59:23   (  -0.12,-127.25) (   0.27,-128.89)  187.19                80
 07/29/2021   09:43:19   (  -0.11,-127.21) (  -0.72,-124.36)  324.16                80
 07/30/2021   22:02:36   (   0.13,-127.05) (  -0.47,-129.66)  298.50                80