Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 15.  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)
 05/15/2023   22:16:47   (  -0.00,-136.99) (   0.92,-133.00)  455.41                80
 05/17/2023   10:35:54   (   0.00,-136.99) (   0.31,-138.26)  145.85                80
 05/18/2023   10:17:11   (   0.00,-136.98) (  -0.75,-133.74)  369.95                80
 05/19/2023   22:39:07   (   0.00,-136.98) (  -0.47,-139.05)  236.03                80
 05/20/2023   22:23:02   (   0.01,-136.97) (   0.54,-134.52)  279.23                80
 05/22/2023   10:42:11   (  -0.01,-136.95) (   0.62,-139.79)  323.42                80
 05/23/2023   10:26:06   (  -0.02,-136.94) (  -0.39,-135.26)  191.50                80
 05/24/2023   22:45:23   (   0.02,-136.93) (  -0.82,-140.57)  415.48                80
 05/25/2023   22:29:18   (   0.02,-136.91) (   0.19,-136.04)   99.42                80
 05/28/2023   10:32:22   (  -0.02,-136.88) (  -0.06,-136.79)   11.10                80