The observations in an Annotate data set use a set of predefined Annotate variables. The values of the variables in the observation determine what is done and how it is done. To create these ...

where to draw those elements (the coordinates of the position on the output) how to draw (characteristics of the element such as size or color). The following sections describe these components of the ...

Astronomical data does not always use Cartesian coordinates. Both all-sky observational data and simulations of rotationally symmetric systems, such as accretion and protoplanetary disks, may use ...