Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  METOP-B Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2021   18:04:27   (  -0.14,-127.78) (  -0.05,-128.09)   35.48                80
 12/21/2021   06:00:08   (   0.13,-127.86) (   0.18,-127.70)   18.69                80
 12/22/2021   18:21:39   (  -0.12,-127.91) (   0.83,-132.26)  495.19                80
 12/23/2021   17:58:20   (  -0.12,-127.94) (  -0.30,-127.27)   77.15                80
 12/25/2021   06:19:59   (   0.10,-127.98) (  -0.75,-131.85)  441.83                80
 12/26/2021   05:56:39   (   0.11,-128.00) (   0.38,-126.86)  130.07                80
 12/27/2021   18:18:11   (  -0.10,-128.04) (   0.63,-131.42)  384.57                80
 12/28/2021   17:54:50   (  -0.11,-128.07) (  -0.44,-126.42)  187.16                80
 12/30/2021   06:16:31   (   0.09,-128.10) (  -0.55,-131.02)  332.87                80
 12/31/2021   05:53:11   (   0.10,-128.12) (   0.58,-126.03)  238.11                80