Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 5 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/31/2021   09:46:12   (   0.06,-128.46) (  -0.56,-125.78)  306.30                80
 06/01/2021   22:08:09   (  -0.06,-128.41) (  -0.63,-131.09)  304.25                80
 06/02/2021   21:52:05   (  -0.07,-128.42) (   0.35,-126.55)  213.33                80
 06/04/2021   10:13:54   (   0.07,-128.51) (   0.80,-131.83)  378.23                80
 06/05/2021   09:52:30   (   0.07,-128.51) (  -0.19,-127.29)  138.64                80
 06/06/2021   22:14:27   (  -0.06,-128.45) (  -1.00,-132.60)  473.32                80
 06/07/2021   21:58:23   (  -0.06,-128.46) (   0.04,-128.08)   43.74                80
 06/10/2021   10:01:28   (   0.06,-128.54) (   0.12,-128.82)   32.05                80
 06/11/2021   09:40:04   (   0.06,-128.54) (  -0.87,-124.29)  483.89                80
 06/12/2021   22:02:01   (  -0.05,-128.45) (  -0.31,-129.59)  129.88                80
 06/13/2021   21:45:57   (  -0.06,-128.45) (   0.68,-125.06)  386.26                80