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) (   0.34,-126.51)  182.16                80
 12/10/2020   10:13:43   (   0.04,-128.12) (   0.84,-131.77)  415.27                80
 12/11/2020   09:52:17   (   0.02,-128.14) (  -0.18,-127.24)  102.92                80
 12/12/2020   22:16:52   (  -0.06,-128.18) (  -1.06,-132.53)  496.06                80
 12/13/2020   21:55:27   (  -0.04,-128.19) (   0.01,-128.01)   21.49                80
 12/16/2020   10:01:07   (   0.07,-128.20) (   0.21,-128.73)   60.08                80
 12/17/2020   09:39:43   (   0.04,-128.21) (  -0.87,-124.21)  457.32                80
 12/18/2020   22:04:17   (  -0.08,-128.25) (  -0.37,-129.50)  142.39                80
 12/19/2020   21:42:52   (  -0.06,-128.26) (   0.65,-124.96)  374.68                80
 12/21/2020   10:07:18   (   0.10,-128.25) (   0.52,-130.23)  224.75                80
 12/22/2020   09:45:52   (   0.08,-128.26) (  -0.50,-125.70)  292.52                80