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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2020   22:16:55   (  -0.06,-128.18) (  -1.02,-132.55)  496.90                80
 12/13/2020   21:55:31   (  -0.05,-128.19) (  -0.01,-128.02)   20.13                80
 12/16/2020   10:01:15   (   0.07,-128.21) (   0.17,-128.76)   62.77                80
 12/17/2020   09:39:50   (   0.04,-128.22) (  -0.84,-124.23)  454.18                80
 12/18/2020   22:04:26   (  -0.08,-128.25) (  -0.39,-129.53)  146.04                80
 12/19/2020   21:43:03   (  -0.06,-128.26) (   0.68,-125.01)  370.56                80
 12/21/2020   10:07:30   (   0.10,-128.26) (   0.54,-130.28)  229.79                80
 12/22/2020   09:46:06   (   0.08,-128.27) (  -0.47,-125.75)  287.02                80
 12/23/2020   22:10:42   (  -0.12,-128.30) (  -0.75,-131.05)  312.99                80
 12/24/2020   21:49:19   (  -0.10,-128.31) (   0.32,-126.53)  203.35                80