Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 10 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/21/2021   10:06:20   (   0.22,-128.29) (   0.73,-130.43)  244.99                80
 10/22/2021   09:50:18   (   0.24,-128.31) (  -0.32,-125.91)  273.26                80
 10/23/2021   22:09:36   (  -0.21,-128.32) (  -0.88,-131.22)  331.01                80
 10/24/2021   21:53:32   (  -0.22,-128.33) (   0.12,-126.69)  186.88                80
 10/26/2021   10:12:44   (   0.19,-128.37) (   0.99,-131.98)  411.75                80
 10/27/2021   09:56:40   (   0.20,-128.38) (  -0.00,-127.45)  105.62                80
 10/28/2021   22:16:00   (  -0.17,-128.38) (  -1.13,-132.77)  499.98                80
 10/29/2021   21:59:56   (  -0.18,-128.39) (  -0.13,-128.24)   17.27                80
 11/01/2021   10:00:23   (   0.17,-128.42) (   0.31,-128.99)   65.12                80
 11/02/2021   09:44:19   (   0.18,-128.43) (  -0.69,-124.46)  451.78                80
 11/03/2021   22:03:39   (  -0.15,-128.42) (  -0.44,-129.78)  154.70                80