Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 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)
 01/20/2021   10:45:38   (  -0.03,-137.22) (   0.58,-139.82)  297.45                80
 01/21/2021   10:24:13   (  -0.03,-137.21) (  -0.44,-135.29)  218.09                80
 01/22/2021   22:46:10   (   0.02,-137.20) (  -0.75,-140.60)  387.46                80
 01/23/2021   22:30:05   (   0.00,-137.19) (   0.27,-136.07)  128.00                80
 01/25/2021   10:51:52   (   0.02,-137.16) (   0.94,-141.33)  475.19                80
 01/26/2021   10:30:28   (   0.01,-137.14) (  -0.08,-136.80)   39.22                80
 01/28/2021   22:33:40   (  -0.01,-137.10) (  -0.09,-137.58)   54.21                80
 01/29/2021   22:17:34   (  -0.01,-137.07) (   0.88,-133.04)  459.82                80
 01/31/2021   10:39:23   (   0.01,-137.03) (   0.28,-138.31)  145.30                80
 02/01/2021   10:17:58   (   0.00,-137.01) (  -0.75,-133.78)  368.34                80
 02/02/2021   22:39:53   (  -0.00,-136.97) (  -0.49,-139.08)  240.11                80