Global coordinate system

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Orbiter's large scale coordinate system is called the Global coordinate system or Global frame. It is a cartesian coordinate system and has its origin in the center of the solar system. It has its three axis vectors oriented like this:

X The X-axis points to the vernal equinox
Y This axis points to the solar zenit
Z The Z-axis is oriented orthogonal to x and y axis.
edit Orbiter coordinate systems
Global coordinate system - Relative coordinate system - Local coordinate system
Local horizon coordinate system - Geographic coordinate system - Surface base coordinate system