Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2021   10:38:19   (  -0.01,-137.21) (   0.27,-138.47)  143.75                80
 12/18/2021   10:22:13   (  -0.00,-137.20) (  -0.76,-133.94)  372.60                80
 12/19/2021   22:41:27   (   0.00,-137.18) (  -0.44,-139.23)  233.17                80
 12/20/2021   22:25:21   (  -0.00,-137.17) (   0.53,-134.69)  282.80                80
 12/22/2021   10:44:27   (   0.00,-137.16) (   0.62,-139.96)  318.35                80
 12/23/2021   10:28:21   (   0.00,-137.15) (  -0.36,-135.41)  197.15                80
 12/24/2021   22:47:36   (  -0.00,-137.12) (  -0.78,-140.72)  409.91                80
 12/25/2021   22:31:30   (  -0.00,-137.11) (   0.20,-136.18)  105.35                80
 12/27/2021   10:50:36   (   0.00,-137.09) (   0.95,-141.45)  496.58                80
 12/28/2021   10:31:49   (   0.00,-137.07) (  -0.03,-136.91)   18.24                80