Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/12/2021   09:52:21   (   0.23,-128.08) (   0.05,-127.24)   95.35                80
 01/14/2021   21:55:33   (  -0.26,-128.08) (  -0.24,-128.02)    7.59                80
 01/17/2021   10:01:16   (   0.28,-127.98) (   0.43,-128.75)   87.00                80
 01/18/2021   09:39:51   (   0.25,-127.96) (  -0.59,-124.22)  426.69                80
 01/19/2021   22:04:27   (  -0.30,-127.98) (  -0.61,-129.52)  174.86                80
 01/20/2021   21:43:03   (  -0.27,-127.96) (   0.41,-125.00)  338.59                80
 01/22/2021   10:07:29   (   0.32,-127.87) (   0.86,-130.25)  270.54                80
 01/23/2021   09:46:05   (   0.30,-127.85) (  -0.16,-125.72)  242.63                80
 01/24/2021   22:10:41   (  -0.34,-127.86) (  -1.03,-131.02)  359.87                80
 01/25/2021   21:49:17   (  -0.32,-127.83) (  -0.01,-126.49)  152.85                80