Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2021   10:06:00   (   0.38,-127.95) (   0.89,-130.38)  276.05                80
 09/20/2021   09:49:55   (   0.38,-127.92) (  -0.11,-125.84)  237.46                80
 09/21/2021   22:09:12   (  -0.37,-127.83) (  -1.12,-131.14)  377.10                80
 09/22/2021   21:53:07   (  -0.38,-127.80) (  -0.11,-126.61)  136.16                80
 09/24/2021   10:12:15   (   0.36,-127.80) (   1.29,-131.88)  465.18                80
 09/25/2021   09:56:11   (   0.37,-127.77) (   0.28,-127.34)   47.89                80
 09/27/2021   21:56:44   (  -0.35,-127.63) (  -0.44,-128.12)   54.96                80
 09/28/2021   21:40:39   (  -0.36,-127.60) (   0.57,-123.59)  457.44                80
 09/30/2021   09:59:48   (   0.34,-127.58) (   0.61,-128.86)  145.72                80
 10/01/2021   09:43:43   (   0.34,-127.54) (  -0.40,-124.33)  366.47                80