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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/15/2021   10:07:47   (   0.04,-128.49) (   0.46,-130.34)  210.67                80
 06/16/2021   09:46:24   (   0.05,-128.48) (  -0.57,-125.82)  304.66                80
 06/17/2021   22:08:21   (  -0.04,-128.39) (  -0.63,-131.12)  310.38                80
 06/18/2021   21:52:17   (  -0.05,-128.38) (   0.34,-126.58)  205.01                80
 06/20/2021   10:11:27   (   0.03,-128.45) (   0.77,-131.87)  389.25                80
 06/21/2021   09:55:22   (   0.04,-128.43) (  -0.20,-127.33)  125.36                80
 06/22/2021   22:14:40   (  -0.02,-128.32) (  -1.00,-132.64)  491.71                80
 06/23/2021   21:58:36   (  -0.03,-128.31) (   0.03,-128.11)   22.73                80
 06/26/2021   09:59:01   (   0.02,-128.34) (   0.16,-128.85)   58.64                80
 06/27/2021   09:42:58   (   0.03,-128.32) (  -0.87,-124.33)  455.38                80
 06/28/2021   22:02:15   (  -0.02,-128.20) (  -0.32,-129.63)  162.50                80