Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/10/2021   10:01:28   (   0.05,-128.52) (   0.11,-128.82)   34.56                80
 06/11/2021   09:40:04   (   0.05,-128.51) (  -0.87,-124.28)  481.12                80
 06/12/2021   22:02:01   (  -0.04,-128.43) (  -0.31,-129.59)  132.62                80
 06/13/2021   21:45:58   (  -0.05,-128.42) (   0.73,-125.07)  383.21                80
 06/15/2021   10:07:46   (   0.04,-128.49) (   0.48,-130.33)  210.74                80
 06/16/2021   09:46:23   (   0.05,-128.48) (  -0.57,-125.81)  304.56                80
 06/17/2021   22:08:19   (  -0.05,-128.38) (  -0.67,-131.11)  310.59                80
 06/18/2021   21:52:15   (  -0.05,-128.37) (   0.37,-126.58)  204.76                80
 06/20/2021   10:11:24   (   0.04,-128.44) (   0.84,-131.85)  389.51                80
 06/21/2021   09:55:20   (   0.05,-128.42) (  -0.21,-127.33)  125.05                80
 06/22/2021   22:14:37   (  -0.03,-128.31) (  -1.02,-132.62)  492.10                80