A set of parameters that uniquely define the place and time of observation. The user may initialize the frame with novas_make_frame(). Once the observer frame is set up, it can be used repeatedly to perform efficient calculations of multiple objects in the coordinate system of choice, much faster than what place() can do. Frames also allow for transforming coordinates calculated for one coordinate syste, into another coordinate system with little effort.
You should never set or change fields in this structure manually. Instead the structure should always be initialized by an appropriate call to novas_make_frame(). After that you may change the observer location, if need be, with novas_change_observer().
The structure may expand with additional field in the future. Thus neither its size nor its particular layout should be assumed fixed over SuperNOVAS releases.
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