Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2021   21:46:51   (  -0.39,-127.95) (   0.22,-125.10)  324.54                80
 09/19/2021   10:05:59   (   0.38,-127.95) (   0.95,-130.37)  275.82                80
 09/20/2021   09:49:54   (   0.38,-127.93) (  -0.05,-125.83)  237.78                80
 09/21/2021   22:09:12   (  -0.37,-127.84) (  -1.11,-131.14)  376.84                80
 09/22/2021   21:53:07   (  -0.38,-127.81) (  -0.11,-126.61)  136.49                80
 09/24/2021   10:12:15   (   0.36,-127.80) (   1.28,-131.88)  464.60                80
 09/25/2021   09:56:11   (   0.37,-127.77) (   0.28,-127.35)   48.55                80
 09/27/2021   21:56:44   (  -0.35,-127.64) (  -0.43,-128.12)   54.28                80
 09/28/2021   21:40:38   (  -0.36,-127.60) (   0.52,-123.58)  458.22                80
 09/30/2021   09:59:48   (   0.34,-127.59) (   0.60,-128.86)  144.69                80