Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2021   22:36:36   (  -0.02,-137.18) (  -0.12,-137.59)   47.31                80
 06/22/2021   22:15:12   (  -0.01,-137.17) (   0.91,-133.06)  467.61                80
 06/24/2021   10:39:41   (   0.00,-137.15) (   0.26,-138.34)  135.05                80
 06/25/2021   10:18:18   (  -0.00,-137.14) (  -0.77,-133.81)  379.35                80
 06/26/2021   22:40:15   (   0.00,-137.11) (  -0.43,-139.12)  228.47                80
 06/27/2021   22:24:11   (   0.01,-137.09) (   0.55,-134.58)  285.97                80
 06/29/2021   10:46:00   (  -0.00,-137.08) (   0.62,-139.86)  316.99                80
 06/30/2021   10:24:37   (  -0.00,-137.06) (  -0.41,-135.33)  197.37                80
 07/01/2021   22:46:34   (  -0.00,-137.03) (  -0.78,-140.64)  410.74                80
 07/02/2021   22:30:29   (   0.00,-137.01) (   0.19,-136.10)  103.43                80