Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 7 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/08/2021   22:15:25   (  -0.02,-137.18) (   0.91,-133.10)  465.70                80
 07/10/2021   10:39:53   (   0.02,-137.18) (   0.31,-138.36)  135.17                80
 07/11/2021   10:18:30   (   0.02,-137.18) (  -0.73,-133.84)  380.61                80
 07/12/2021   22:43:07   (  -0.02,-137.17) (  -0.46,-139.14)  224.94                80
 07/13/2021   22:21:44   (  -0.02,-137.16) (   0.57,-134.62)  290.64                80
 07/15/2021   10:46:12   (   0.03,-137.16) (   0.64,-139.88)  311.05                80
 07/16/2021   10:24:48   (   0.03,-137.15) (  -0.40,-135.36)  204.19                80
 07/17/2021   22:49:25   (  -0.03,-137.13) (  -0.85,-140.65)  402.56                80
 07/18/2021   22:28:01   (  -0.02,-137.12) (   0.19,-136.13)  112.02                80
 07/20/2021   10:52:31   (   0.01,-137.09) (   0.96,-141.41)  491.56                80
 07/21/2021   10:33:46   (  -0.00,-137.07) (  -0.02,-136.87)   22.42                80