Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 7.  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)
 01/07/2023   22:18:06   (   0.00,-136.92) (   0.89,-133.03)  444.16                80
 01/09/2023   10:39:53   (  -0.01,-136.93) (   0.30,-138.30)  156.52                80
 01/10/2023   10:18:29   (  -0.01,-136.92) (  -0.74,-133.78)  358.96                80
 01/11/2023   22:40:24   (   0.01,-136.90) (  -0.49,-139.07)  248.46                80
 01/12/2023   22:24:19   (   0.02,-136.89) (   0.55,-134.55)  266.96                80
 01/14/2023   10:46:07   (  -0.02,-136.89) (   0.63,-139.82)  334.20                80
 01/15/2023   10:24:41   (  -0.02,-136.87) (  -0.35,-135.28)  180.67                80
 01/16/2023   22:46:38   (   0.02,-136.84) (  -0.80,-140.60)  428.30                80
 01/17/2023   22:30:32   (   0.03,-136.82) (   0.18,-136.06)   86.00                80
 01/20/2023   10:33:35   (  -0.04,-136.78) (  -0.06,-136.81)    4.61                80