Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 4.  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)
 06/05/2023   20:38:29   (   0.00,-104.71) (  -0.92,-108.84)  471.22                80
 06/06/2023   20:22:25   (   0.01,-104.71) (   0.11,-104.32)   44.76                80
 06/09/2023   08:25:28   (  -0.02,-104.71) (   0.05,-105.06)   39.60                80
 06/10/2023   08:04:03   (  -0.02,-104.71) (  -0.98,-100.53)  476.40                80
 06/11/2023   20:26:00   (   0.02,-104.70) (  -0.21,-105.84)  129.42                80
 06/12/2023   20:09:54   (   0.02,-104.70) (   0.76,-101.30)  387.20                80
 06/14/2023   08:31:41   (  -0.02,-104.71) (   0.42,-106.57)  211.95                80
 06/15/2023   08:10:17   (  -0.02,-104.71) (  -0.61,-102.04)  304.23                80
 06/16/2023   20:32:13   (   0.03,-104.70) (  -0.56,-107.35)  302.25                80
 06/17/2023   20:16:09   (   0.03,-104.70) (   0.47,-102.82)  214.25                80