Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 06/04/2023   08:16:33   (   0.00,-104.72) (  -0.25,-103.53)  134.98                80
 06/05/2023   20:38:29   (   0.00,-104.71) (  -0.95,-108.84)  471.33                80
 06/06/2023   20:22:24   (   0.00,-104.70) (   0.08,-104.31)   44.63                80
 06/09/2023   08:25:27   (  -0.01,-104.71) (   0.08,-105.05)   39.83                80
 06/10/2023   08:04:03   (  -0.01,-104.70) (  -0.95,-100.52)  476.12                80
 06/11/2023   20:25:59   (   0.02,-104.69) (  -0.24,-105.83)  129.79                80
 06/12/2023   20:09:55   (   0.02,-104.69) (   0.79,-101.30)  386.71                80
 06/14/2023   08:31:42   (  -0.02,-104.71) (   0.40,-106.57)  212.36                80
 06/15/2023   08:10:17   (  -0.02,-104.71) (  -0.64,-102.05)  303.77                80
 06/16/2023   20:32:13   (   0.02,-104.69) (  -0.60,-107.34)  302.80                80