Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 10.  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) (   0.14,-128.81)   34.62                80
 06/11/2021   09:40:05   (   0.05,-128.51) (  -0.91,-124.29)  481.15                80
 06/12/2021   22:02:02   (  -0.04,-128.43) (  -0.28,-129.60)  132.61                80
 06/13/2021   21:45:57   (  -0.05,-128.42) (   0.71,-125.06)  383.25                80
 06/15/2021   10:07:47   (   0.04,-128.49) (   0.44,-130.34)  210.68                80
 06/16/2021   09:46:22   (   0.05,-128.48) (  -0.55,-125.81)  304.62                80
 06/17/2021   22:08:20   (  -0.05,-128.38) (  -0.63,-131.11)  310.52                80
 06/18/2021   21:52:15   (  -0.05,-128.37) (   0.36,-126.58)  204.84                80
 06/20/2021   10:11:24   (   0.04,-128.44) (   0.79,-131.86)  389.41                80
 06/21/2021   09:55:20   (   0.05,-128.42) (  -0.20,-127.32)  125.16                80
 06/22/2021   22:14:37   (  -0.03,-128.31) (  -0.98,-132.63)  491.96                80
 06/23/2021   21:58:33   (  -0.03,-128.29) (   0.01,-128.10)   22.35                80