Star plots are radar maps that can map specific constellations, planets, individual stars, and constellation families in a two-demensional projection. They portray the location of the subject at hand at specific hours of the night on a grid. Different star plots can highlight different aspects of the night sky and can be mapped differently depending on the tilt of the axis and relative position to the cartographer.
In this particular star plot, the constellation Aquarius is the focus. Along the top and bottom of the square the hours of the day in which this map is portraying. Along the left and right side of the square map are the degrees, longitude and latitude, for which the constellation is located at which hour of the night. The plot acts on a grid system. The grid lines are slightly curved relevant to the curvature of the earth and the blue line that goes through the middle is the relative meridian. The plot is most accurate closest to the blue line.
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