Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 1 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)
 01/12/2020   21:58:12   (   0.04,-128.41) (   0.12,-128.04)   41.47                80
 01/15/2020   09:58:34   (  -0.05,-128.43) (   0.01,-128.78)   39.24                80
 01/16/2020   09:42:28   (  -0.04,-128.44) (  -1.00,-124.25)  477.95                80
 01/17/2020   22:01:42   (   0.05,-128.42) (  -0.23,-129.54)  127.80                80
 01/18/2020   21:45:37   (   0.04,-128.42) (   0.79,-125.00)  389.06                80
 01/20/2020   10:04:44   (  -0.04,-128.44) (   0.35,-130.28)  209.57                80
 01/21/2020   09:48:39   (  -0.04,-128.43) (  -0.66,-125.74)  307.07                80
 01/22/2020   22:07:53   (   0.04,-128.41) (  -0.56,-131.04)  299.24                80
 01/23/2020   21:51:48   (   0.03,-128.41) (   0.46,-126.50)  217.04                80
 01/25/2020   10:10:54   (  -0.03,-128.41) (   0.74,-131.76)  382.54                80