Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/21/2021   22:09:12   (  -0.37,-127.83) (  -1.09,-131.14)  377.03                80
 09/22/2021   21:53:08   (  -0.38,-127.80) (  -0.09,-126.61)  136.13                80
 09/24/2021   10:12:16   (   0.36,-127.79) (   1.26,-131.88)  466.00                80
 09/25/2021   09:56:11   (   0.37,-127.76) (   0.26,-127.35)   46.97                80
 09/27/2021   21:56:43   (  -0.35,-127.63) (  -0.47,-128.11)   55.61                80
 09/28/2021   21:40:39   (  -0.36,-127.59) (   0.53,-123.58)  456.60                80
 09/30/2021   09:59:47   (   0.34,-127.56) (   0.64,-128.85)  147.28                80
 10/01/2021   09:43:43   (   0.34,-127.52) (  -0.37,-124.32)  364.76                80
 10/02/2021   22:03:00   (  -0.32,-127.42) (  -0.79,-129.63)  251.29                80
 10/03/2021   21:46:54   (  -0.33,-127.37) (   0.16,-125.08)  260.48                80