What Types of Map can you Display in C2A?

C2A lets you display two different kinds of map:

  • Maps of the Field type. In this kind of map, north is at the top of the screen by default regardless of your location on the sky. This makes it easy to create field maps when preparing for observation. You can apply symmetries and rotations to views of the field type, and these will be applied to all displayed fields.

 When a map of the field type is displayed, the symbol above is displayed in the top left of the view. The small yellow dash indicates the direction of North.

  • Maps of the Horizon type. In this kind of map, the field is oriented so that the nearest horizon will be horizontal in the view displayed on the screen. This type of map lets you easily display a given horizon to identify, for instance, the large scale pattern of the brightest stars of a constellation.

 When a map of the Horizon type is displayed, the symbol above appears in the top left of the view. The number shown in the symbol is the current azimuth of the view.

Once a view type has been selected, it remains (even after zooms and translations) until it is explicitly changed by the user. For maps of the “Field” type, the orientation stays the same; and for “Horizon” type views the map is always oriented so that the perpendicular to the nearest horizon points towards the bottom of the screen.

You can at any time move from one type of view to the other in several ways:

Table of Contents