Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/17/2021   22:08:21   (  -0.04,-128.39) (  -0.64,-131.12)  310.86                80
 06/18/2021   21:52:16   (  -0.05,-128.38) (   0.33,-126.58)  204.39                80
 06/20/2021   10:11:27   (   0.04,-128.44) (   0.78,-131.87)  390.05                80
 06/21/2021   09:55:22   (   0.04,-128.42) (  -0.19,-127.33)  124.42                80
 06/22/2021   22:14:40   (  -0.03,-128.31) (  -1.00,-132.64)  492.84                80
 06/23/2021   21:58:36   (  -0.03,-128.29) (   0.03,-128.11)   21.49                80
 06/26/2021   09:59:01   (   0.03,-128.33) (   0.17,-128.85)   60.20                80
 06/27/2021   09:42:58   (   0.04,-128.30) (  -0.87,-124.33)  453.66                80
 06/28/2021   22:02:15   (  -0.03,-128.18) (  -0.32,-129.63)  164.41                80
 06/29/2021   21:46:10   (  -0.04,-128.16) (   0.66,-125.09)  349.75                80