Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 1 20.  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)
 01/20/2023   10:30:53   (   0.01,-136.93) (  -0.00,-136.80)   15.11                80
 01/22/2023   22:34:04   (  -0.01,-136.91) (  -0.14,-137.58)   75.69                80
 01/23/2023   22:17:59   (  -0.01,-136.90) (   0.87,-133.04)  439.79                80
 01/25/2023   10:39:45   (   0.01,-136.89) (   0.34,-138.31)  162.19                80
 01/26/2023   10:18:19   (   0.00,-136.88) (  -0.67,-133.77)  353.15                80
 01/27/2023   22:40:15   (  -0.00,-136.86) (  -0.51,-139.08)  253.31                80
 01/28/2023   22:24:09   (  -0.00,-136.85) (   0.50,-134.55)  261.84                80
 01/30/2023   10:45:56   (   0.01,-136.82) (   0.69,-139.81)  340.76                80
 01/31/2023   10:24:30   (   0.01,-136.81) (  -0.33,-135.28)  173.95                80
 02/01/2023   22:46:24   (  -0.01,-136.78) (  -0.89,-140.58)  433.74                80
 02/02/2023   22:30:19   (  -0.01,-136.76) (   0.13,-136.04)   80.66                80