Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 01/22/2023   22:34:04   (   0.01,-136.90) (  -0.15,-137.57)   76.75                80
 01/23/2023   22:17:58   (   0.01,-136.89) (   0.85,-133.04)  438.41                80
 01/25/2023   10:37:06   (  -0.01,-136.87) (   0.29,-138.32)  164.25                80
 01/26/2023   10:21:00   (  -0.01,-136.86) (  -0.72,-133.78)  350.87                80
 01/27/2023   22:40:15   (   0.02,-136.84) (  -0.46,-139.09)  255.99                80
 01/28/2023   22:24:10   (   0.02,-136.82) (   0.55,-134.56)  258.88                80
 01/30/2023   10:43:16   (  -0.02,-136.80) (   0.64,-139.82)  344.59                80
 01/31/2023   10:27:11   (  -0.03,-136.78) (  -0.38,-135.29)  169.77                80
 02/01/2023   22:46:25   (   0.03,-136.74) (  -0.84,-140.59)  438.45                80
 02/02/2023   22:30:20   (   0.03,-136.72) (   0.18,-136.06)   75.58                80