Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/11/2021   10:13:45   (   0.26,-128.10) (   1.07,-131.77)  418.44                80
 01/12/2021   09:52:21   (   0.23,-128.08) (   0.06,-127.24)   95.44                80
 01/14/2021   21:55:33   (  -0.26,-128.08) (  -0.25,-128.02)    7.77                80
 01/17/2021   10:01:16   (   0.28,-127.99) (   0.44,-128.75)   86.69                80
 01/18/2021   09:39:51   (   0.25,-127.97) (  -0.58,-124.22)  427.03                80
 01/19/2021   22:04:27   (  -0.29,-127.99) (  -0.62,-129.52)  174.48                80
 01/20/2021   21:43:03   (  -0.27,-127.97) (   0.40,-124.99)  339.00                80
 01/22/2021   10:07:29   (   0.32,-127.88) (   0.87,-130.24)  270.03                80
 01/23/2021   09:46:05   (   0.30,-127.86) (  -0.15,-125.72)  243.19                80
 01/24/2021   22:10:41   (  -0.34,-127.87) (  -1.03,-131.02)  359.29                80