Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2020   10:07:30   (   0.10,-128.24) (   0.57,-130.27)  231.53                80
 12/22/2020   09:46:06   (   0.08,-128.25) (  -0.50,-125.75)  284.94                80
 12/23/2020   22:10:42   (  -0.12,-128.28) (  -0.73,-131.05)  315.60                80
 12/24/2020   21:49:18   (  -0.10,-128.28) (   0.28,-126.52)  200.38                80
 12/26/2020   10:13:45   (   0.14,-128.26) (   0.93,-131.78)  401.54                80
 12/27/2020   09:52:21   (   0.12,-128.26) (  -0.08,-127.25)  114.32                80
 12/28/2020   22:16:57   (  -0.17,-128.28) (  -1.13,-132.55)  486.97                80
 12/29/2020   21:55:34   (  -0.15,-128.28) (  -0.06,-128.04)   28.37                80
 01/01/2021   10:01:16   (   0.17,-128.23) (   0.26,-128.77)   60.49                80
 01/02/2021   09:39:52   (   0.15,-128.23) (  -0.75,-124.24)  454.44                80