Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/04/2021   10:13:54   (   0.06,-128.50) (   0.79,-131.83)  378.77                80
 06/05/2021   09:52:30   (   0.07,-128.51) (  -0.19,-127.29)  137.98                80
 06/06/2021   22:14:27   (  -0.06,-128.44) (  -1.00,-132.60)  473.96                80
 06/07/2021   21:58:24   (  -0.06,-128.45) (   0.04,-128.08)   42.96                80
 06/10/2021   10:01:28   (   0.05,-128.53) (   0.12,-128.82)   33.45                80
 06/11/2021   09:40:04   (   0.06,-128.52) (  -0.86,-124.28)  482.36                80
 06/12/2021   22:02:01   (  -0.05,-128.44) (  -0.32,-129.59)  131.40                80
 06/13/2021   21:45:58   (  -0.06,-128.44) (   0.73,-125.07)  384.61                80
 06/15/2021   10:07:46   (   0.05,-128.51) (   0.48,-130.33)  208.74                80
 06/16/2021   09:46:23   (   0.06,-128.50) (  -0.56,-125.81)  306.69                80