Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 4 30.  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)
 05/01/2023   10:38:27   (   0.00,-136.99) (   0.28,-138.21)  138.55                80
 05/02/2023   10:17:03   (   0.00,-136.99) (  -0.76,-133.69)  377.19                80
 05/03/2023   22:39:00   (   0.00,-136.99) (  -0.43,-139.00)  228.95                80
 05/04/2023   22:22:56   (   0.00,-136.98) (   0.56,-134.47)  286.38                80
 05/06/2023   10:44:44   (  -0.00,-136.97) (   0.64,-139.74)  316.13                80
 05/07/2023   10:23:21   (  -0.00,-136.96) (  -0.40,-135.22)  198.50                80
 05/08/2023   22:45:18   (   0.00,-136.93) (  -0.77,-140.53)  409.62                80
 05/09/2023   22:29:14   (   0.00,-136.91) (   0.22,-136.00)  104.43                80
 05/11/2023   10:51:02   (   0.00,-136.88) (   0.97,-141.27)  499.57                80
 05/12/2023   10:29:37   (   0.01,-136.86) (  -0.02,-136.74)   14.37                80