Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2021   10:28:21   (  -0.02,-137.21) (  -0.41,-135.42)  203.46                80
 12/24/2021   22:47:37   (   0.02,-137.21) (  -0.74,-140.73)  401.10                80
 12/25/2021   22:31:30   (   0.02,-137.21) (   0.24,-136.19)  115.74                80
 12/27/2021   10:50:37   (  -0.02,-137.21) (   0.90,-141.46)  484.06                80
 12/28/2021   10:34:30   (  -0.02,-137.20) (  -0.08,-136.92)   32.32                80
 12/30/2021   22:34:59   (   0.01,-137.17) (  -0.08,-137.68)   57.64                80
 12/31/2021   22:18:52   (   0.00,-137.16) (   0.91,-133.14)  458.14                80
 01/02/2022   10:37:58   (   0.01,-137.14) (   0.29,-138.40)  143.43                80
 01/03/2022   10:19:11   (   0.01,-137.12) (  -0.70,-133.86)  371.68                80
 01/04/2022   22:41:06   (  -0.01,-137.09) (  -0.49,-139.16)  235.90                80
 01/05/2022   22:25:00   (  -0.01,-137.07) (   0.55,-134.63)  279.13                80