Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2021   21:57:13   (   0.02,-127.69) (  -0.09,-128.22)   60.21                80
 12/17/2021   21:41:06   (   0.00,-127.65) (   0.89,-123.68)  452.54                80
 12/19/2021   10:00:13   (  -0.02,-127.57) (   0.26,-128.95)  155.91                80
 12/20/2021   09:44:06   (  -0.01,-127.53) (  -0.71,-124.40)  356.23                80
 12/21/2021   22:03:20   (   0.03,-127.46) (  -0.49,-129.70)  255.09                80
 12/22/2021   21:47:15   (   0.02,-127.42) (   0.54,-125.17)  256.96                80
 12/24/2021   10:06:20   (  -0.04,-127.34) (   0.66,-130.43)  351.88                80
 12/25/2021   09:50:14   (  -0.03,-127.29) (  -0.32,-125.88)  159.76                80
 12/26/2021   22:09:29   (   0.05,-127.22) (  -0.82,-131.19)  452.62                80
 12/27/2021   21:53:23   (   0.04,-127.17) (   0.15,-126.65)   58.96                80