Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 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)
 01/18/2021   09:39:51   (   0.25,-127.95) (  -0.59,-124.22)  425.63                80
 01/19/2021   22:04:27   (  -0.30,-127.97) (  -0.67,-129.51)  176.49                80
 01/20/2021   21:43:03   (  -0.27,-127.94) (   0.41,-125.00)  336.68                80
 01/22/2021   10:07:29   (   0.32,-127.85) (   0.85,-130.25)  272.73                80
 01/23/2021   09:46:05   (   0.30,-127.83) (  -0.17,-125.72)  240.13                80
 01/24/2021   22:10:40   (  -0.34,-127.83) (  -1.08,-131.01)  362.98                80
 01/25/2021   21:49:17   (  -0.32,-127.80) (  -0.00,-126.49)  149.50                80
 01/27/2021   10:13:43   (   0.36,-127.69) (   1.27,-131.74)  461.30                80
 01/28/2021   09:52:19   (   0.34,-127.66) (   0.24,-127.21)   50.75                80
 01/30/2021   21:58:09   (  -0.37,-127.62) (  -0.46,-127.98)   41.58                80