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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/06/2021   22:14:28   (  -0.06,-128.44) (  -0.96,-132.61)  474.23                80
 06/07/2021   21:58:23   (  -0.06,-128.44) (   0.02,-128.07)   42.48                80
 06/10/2021   10:01:28   (   0.05,-128.52) (   0.14,-128.81)   34.49                80
 06/11/2021   09:40:05   (   0.06,-128.51) (  -0.90,-124.29)  481.31                80
 06/12/2021   22:02:02   (  -0.05,-128.43) (  -0.28,-129.60)  132.48                80
 06/13/2021   21:45:57   (  -0.05,-128.43) (   0.71,-125.06)  383.42                80
 06/15/2021   10:07:47   (   0.05,-128.49) (   0.44,-130.34)  210.33                80
 06/16/2021   09:46:22   (   0.06,-128.48) (  -0.54,-125.81)  304.98                80
 06/17/2021   22:08:19   (  -0.05,-128.39) (  -0.63,-131.11)  310.21                80
 06/18/2021   21:52:15   (  -0.06,-128.38) (   0.36,-126.58)  205.19                80