Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 12 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2021   09:56:43   (  -0.01,-127.78) (  -0.06,-127.45)   36.81                80
 12/16/2021   21:57:12   (   0.02,-127.69) (  -0.12,-128.21)   60.16                80
 12/17/2021   21:41:07   (   0.00,-127.65) (   0.91,-123.68)  452.65                80
 12/19/2021   10:00:12   (  -0.02,-127.58) (   0.30,-128.94)  155.54                80
 12/20/2021   09:44:07   (  -0.01,-127.53) (  -0.74,-124.41)  356.68                80
 12/21/2021   22:03:21   (   0.03,-127.47) (  -0.47,-129.70)  254.68                80
 12/22/2021   21:47:14   (   0.02,-127.42) (   0.51,-125.16)  257.40                80
 12/24/2021   10:06:21   (  -0.04,-127.35) (   0.64,-130.43)  351.22                80
 12/25/2021   09:50:14   (  -0.03,-127.30) (  -0.34,-125.89)  160.46                80
 12/26/2021   22:09:29   (   0.05,-127.22) (  -0.86,-131.18)  451.89                80
 12/27/2021   21:53:23   (   0.04,-127.17) (   0.18,-126.66)   59.80                80