Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 10 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/09/2021   10:34:23   (   0.04,-137.21) (  -0.02,-136.92)   33.47                80
 10/11/2021   22:34:55   (  -0.04,-137.18) (  -0.17,-137.68)   57.32                80
 10/12/2021   22:18:51   (  -0.04,-137.17) (   0.84,-133.15)  457.89                80
 10/14/2021   10:37:59   (   0.03,-137.16) (   0.32,-138.42)  144.42                80
 10/15/2021   10:21:54   (   0.03,-137.14) (  -0.69,-133.89)  370.59                80
 10/16/2021   22:41:11   (  -0.02,-137.12) (  -0.50,-139.19)  236.42                80
 10/17/2021   22:25:06   (  -0.02,-137.11) (   0.51,-134.66)  278.65                80
 10/19/2021   10:44:15   (   0.02,-137.09) (   0.65,-139.93)  323.76                80
 10/20/2021   10:28:10   (   0.02,-137.07) (  -0.36,-135.40)  191.07                80
 10/21/2021   22:47:26   (  -0.02,-137.04) (  -0.83,-140.70)  416.50                80
 10/22/2021   22:31:22   (  -0.02,-137.02) (   0.19,-136.17)   97.93                80