Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 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)
 12/18/2020   22:04:27   (  -0.09,-128.24) (  -0.37,-129.53)  146.92                80
 12/19/2020   21:43:02   (  -0.06,-128.25) (   0.64,-125.00)  369.43                80
 12/21/2020   10:07:30   (   0.10,-128.24) (   0.57,-130.27)  231.29                80
 12/22/2020   09:46:06   (   0.08,-128.25) (  -0.49,-125.75)  285.29                80
 12/23/2020   22:10:42   (  -0.12,-128.28) (  -0.73,-131.05)  315.06                80
 12/24/2020   21:49:18   (  -0.10,-128.29) (   0.28,-126.52)  201.03                80
 12/26/2020   10:13:45   (   0.14,-128.27) (   0.93,-131.78)  400.77                80
 12/27/2020   09:52:21   (   0.12,-128.27) (  -0.08,-127.25)  115.22                80
 12/28/2020   22:16:57   (  -0.17,-128.29) (  -1.14,-132.55)  485.87                80
 12/29/2020   21:55:34   (  -0.15,-128.29) (  -0.06,-128.04)   29.49                80