Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/01/2021   22:08:09   (  -0.06,-128.41) (  -0.66,-131.08)  304.24                80
 06/02/2021   21:52:05   (  -0.07,-128.42) (   0.38,-126.56)  213.31                80
 06/04/2021   10:13:54   (   0.06,-128.51) (   0.83,-131.82)  378.39                80
 06/05/2021   09:52:30   (   0.07,-128.51) (  -0.22,-127.30)  138.46                80
 06/06/2021   22:14:27   (  -0.06,-128.45) (  -0.97,-132.61)  473.50                80
 06/07/2021   21:58:23   (  -0.06,-128.45) (   0.01,-128.07)   43.47                80
 06/10/2021   10:01:28   (   0.06,-128.54) (   0.15,-128.81)   32.56                80
 06/11/2021   09:40:04   (   0.06,-128.53) (  -0.90,-124.29)  483.51                80
 06/12/2021   22:02:02   (  -0.05,-128.45) (  -0.28,-129.60)  130.27                80
 06/13/2021   21:45:57   (  -0.06,-128.45) (   0.71,-125.06)  385.86                80