Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2020   22:10:42   (  -0.12,-128.27) (  -0.74,-131.05)  315.87                80
 12/24/2020   21:49:18   (  -0.10,-128.28) (   0.27,-126.52)  200.02                80
 12/26/2020   10:13:45   (   0.14,-128.25) (   0.94,-131.78)  402.11                80
 12/27/2020   09:52:22   (   0.12,-128.25) (  -0.13,-127.26)  113.64                80
 12/28/2020   22:16:57   (  -0.17,-128.27) (  -1.15,-132.55)  487.86                80
 12/29/2020   21:55:33   (  -0.15,-128.27) (  -0.08,-128.03)   27.23                80
 01/01/2021   10:01:16   (   0.17,-128.22) (   0.28,-128.77)   61.69                80
 01/02/2021   09:39:52   (   0.15,-128.21) (  -0.73,-124.24)  453.05                80
 01/03/2021   22:04:28   (  -0.19,-128.23) (  -0.47,-129.54)  149.51                80
 01/04/2021   21:43:04   (  -0.16,-128.21) (   0.54,-125.01)  364.82                80