Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2020   21:55:31   (  -0.05,-128.19) (   0.00,-128.02)   20.10                80
 12/16/2020   10:01:14   (   0.07,-128.20) (   0.21,-128.75)   62.88                80
 12/17/2020   09:39:50   (   0.04,-128.22) (  -0.85,-124.23)  454.06                80
 12/18/2020   22:04:27   (  -0.08,-128.25) (  -0.38,-129.53)  146.14                80
 12/19/2020   21:43:03   (  -0.06,-128.26) (   0.69,-125.02)  370.43                80
 12/21/2020   10:07:30   (   0.10,-128.26) (   0.53,-130.28)  230.00                80
 12/22/2020   09:46:06   (   0.08,-128.27) (  -0.48,-125.75)  286.80                80
 12/23/2020   22:10:42   (  -0.12,-128.30) (  -0.74,-131.05)  313.19                80
 12/24/2020   21:49:19   (  -0.10,-128.31) (   0.32,-126.53)  203.13                80
 12/26/2020   10:13:46   (   0.14,-128.29) (   0.90,-131.79)  398.41                80