Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2020   21:49:17   (  -0.00,-128.11) (   0.36,-126.51)  182.11                80
 12/10/2020   10:13:42   (   0.04,-128.12) (   0.88,-131.76)  415.31                80
 12/11/2020   09:52:18   (   0.02,-128.14) (  -0.20,-127.24)  102.84                80
 12/12/2020   22:16:52   (  -0.06,-128.18) (  -1.04,-132.53)  496.31                80
 12/13/2020   21:55:27   (  -0.04,-128.19) (  -0.03,-128.00)   21.34                80
 12/16/2020   10:01:08   (   0.07,-128.20) (   0.19,-128.73)   60.36                80
 12/17/2020   09:39:42   (   0.04,-128.21) (  -0.83,-124.20)  456.93                80
 12/18/2020   22:04:17   (  -0.08,-128.24) (  -0.35,-129.50)  142.97                80
 12/19/2020   21:42:52   (  -0.06,-128.25) (   0.67,-124.97)  374.06                80
 12/21/2020   10:07:17   (   0.10,-128.25) (   0.56,-130.22)  225.33                80