Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 16.  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)
 04/17/2023   22:39:13   (   0.00,-137.00) (  -0.43,-139.02)  230.08                80
 04/18/2023   22:23:07   (  -0.00,-137.00) (   0.59,-134.49)  287.42                80
 04/20/2023   10:44:51   (   0.00,-137.01) (   0.62,-139.74)  310.91                80
 04/21/2023   10:23:24   (   0.00,-137.01) (  -0.40,-135.20)  206.18                80
 04/22/2023   22:45:18   (   0.00,-137.00) (  -0.78,-140.50)  398.62                80
 04/23/2023   22:29:11   (   0.00,-137.00) (   0.25,-135.96)  118.06                80
 04/25/2023   10:50:56   (   0.00,-137.00) (   0.95,-141.22)  481.40                80
 04/26/2023   10:29:29   (   0.00,-136.99) (  -0.08,-136.68)   35.09                80
 04/28/2023   22:32:35   (  -0.02,-136.95) (  -0.10,-137.43)   54.26                80
 04/29/2023   22:16:27   (  -0.02,-136.94) (   0.88,-132.89)  461.96                80