Difference between revisions of "Launch Azimuth"
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− | The '''launch azimuth''' is the angle between north direction and the projection of the initial orbit plane onto the launch location. 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It is the compass heading you head for when you launch. |
==Relation between latitude and inclination== | ==Relation between latitude and inclination== | ||
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This shows mathematically why the inclination must be greater than the launch latitude: Otherwise, the argument to the inverse sine function would be greater than 1, which is out of its domain. Therefore there is no solution in this case. | This shows mathematically why the inclination must be greater than the launch latitude: Otherwise, the argument to the inverse sine function would be greater than 1, which is out of its domain. Therefore there is no solution in this case. | ||
− | Also, note that frequently there are two solutions: one northbound and one southbound. There is only one solution if the inclination is precisely equal to the latitude, and that is due east. There is only one solution if the inclination plus latitude exactly equals 180 | + | Also, note that frequently there are two solutions: one northbound and one southbound. There is only one solution if the inclination is precisely equal to the latitude, and that is due east. There is only one solution if the inclination plus latitude exactly equals 180 |
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Revision as of 16:06, 9 November 2007
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Relation between latitude and inclination
Not all inclinations can be reached at a position on a celestial body. The problem is, that the launch location has to be a point inside the target orbit plane. So, if the latitude of a launch location is higher than the inclination, the orbit can't be reached directly.
Using spherical trigonometry, we can calculate the launch azimuth required to hit any allowed orbit inclination.
where is the desired orbit inclination, is the launch site latitude, and is the launch azimuth. Solving for azimuth:
This shows mathematically why the inclination must be greater than the launch latitude: Otherwise, the argument to the inverse sine function would be greater than 1, which is out of its domain. Therefore there is no solution in this case.
Also, note that frequently there are two solutions: one northbound and one southbound. There is only one solution if the inclination is precisely equal to the latitude, and that is due east. There is only one solution if the inclination plus latitude exactly equals 180