Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 21.  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) (   0.55,-130.27)  231.56                80
 12/22/2020   09:46:06   (   0.08,-128.25) (  -0.46,-125.74)  284.85                80
 12/23/2020   22:10:42   (  -0.12,-128.28) (  -0.76,-131.04)  315.76                80
 12/24/2020   21:49:18   (  -0.10,-128.28) (   0.31,-126.52)  200.18                80
 12/26/2020   10:13:46   (   0.14,-128.26) (   0.91,-131.79)  401.82                80
 12/27/2020   09:52:21   (   0.12,-128.26) (  -0.10,-127.26)  113.97                80
 12/28/2020   22:16:57   (  -0.17,-128.28) (  -1.11,-132.56)  487.39                80
 12/29/2020   21:55:33   (  -0.15,-128.27) (  -0.10,-128.03)   27.72                80
 01/01/2021   10:01:16   (   0.17,-128.23) (   0.30,-128.76)   61.00                80
 01/02/2021   09:39:52   (   0.15,-128.22) (  -0.77,-124.25)  453.82                80
 01/03/2021   22:04:28   (  -0.19,-128.23) (  -0.50,-129.53)  148.65                80