Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2020   10:01:14   (   0.07,-128.20) (   0.20,-128.75)   63.05                80
 12/17/2020   09:39:51   (   0.05,-128.21) (  -0.87,-124.24)  453.76                80
 12/18/2020   22:04:27   (  -0.09,-128.25) (  -0.36,-129.54)  146.58                80
 12/19/2020   21:43:02   (  -0.06,-128.25) (   0.65,-125.01)  369.90                80
 12/21/2020   10:07:30   (   0.10,-128.25) (   0.57,-130.27)  230.65                80
 12/22/2020   09:46:06   (   0.08,-128.26) (  -0.50,-125.75)  286.07                80
 12/23/2020   22:10:43   (  -0.12,-128.29) (  -0.72,-131.05)  314.03                80
 12/24/2020   21:49:18   (  -0.10,-128.30) (   0.29,-126.52)  202.19                80
 12/26/2020   10:13:45   (   0.14,-128.28) (   0.93,-131.78)  399.47                80
 12/27/2020   09:52:21   (   0.12,-128.28) (  -0.08,-127.25)  116.66                80
 12/28/2020   22:16:57   (  -0.17,-128.31) (  -1.13,-132.56)  484.17                80