Midpoints and Aspects
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Basic astro-locality mapping consists of lines indicating conjunctions of the planets with the chart angles. However, by simple extension, it is also possible to construct such lines for planetary midpoints, and for additional aspects of planets to the angles, such as squares, trines and sextiles to each chart angle.
It should be noted that a planetary midpoint is normally calculated as a midpoint in celestial longitude, and when the “Zodiacal” mapping option is selected, this convention is adhered to. However, when the “In Mundo” option is selected, the planetary midpoint is calculated as the midpoint in right ascension instead. This adjustment is necessary to ensure consistency with the coordinate system in which these calculations are taking place.
Similarly, when aspects other than conjunctions are used, the aspects are of longitude when the “Zodiacal” mapping option is selected, and of right ascension when the “In Mundo” mapping option is selected.
As these extended techniques have only become popularised with the advent of advanced computer software, there is as yet little written about them in the literature.
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