The Spectraliser is a program designed to analyse the zodiac circle according to the distribution of potential aspects. This approach was inspired by the "A5 Spectrum," developed in 1977 for research into astrological harmonics. Sadly, as far as I'm aware, the original techniques were never published in the form of useful software. The Spectraliser performs the same sort of analysis, with more options to provide avenues of research, and is freely available to the public through the input form above.
The purpose of this analysis is to determine how "heavy" with potential aspects each portion of the zodiac is in a particular chart. Every planet has a placement in the sky at a particular time. That placement provides a number (dependent on your aspect list) of possible aspect locations around the circle. If another planet happens to fall in one of those locations, we say there is an aspect. The idea is that these degrees are more "active" in a chart than degrees with fewer or no potential aspects. This analyser will count up these locations around the circle, according to the placement of every planet, and turn them into a waveform.
It is crucially important you understand that the waveform output of this analyser is not a timeline. The entire wave is present at one time and is an "unwrapping" of the circle into a straight line. This resulting wave will show how many planets are ready to make aspects to a particular portion of the circle if a planet were present. These aspects have nothing to do with aspects between two planets in terms of angular separation. All the aspects measured by this program are between planets and degrees of the zodiac. The red, horizontal line represents the average of all values. The green, horizontal line is the median of all values.
There are two aspect lists available in the drop down menu labeled Aspects. The traditional aspect list is a list of the 10 common aspects, all derivable from the number 360 using pure integer operations. The full aspect list is a list of 34 aspects, all derivable from 360, but only the quotients are guaranteed to be integers (not the divisors). The reasoning for the full aspect list can be found in the article on aspect derivation here.
The grouping of 8 checkboxes above determine which bodies and points will be used for aspects in the calculation of the waveform. The checkbox labelled "weighted" determines how much "strength" is given to each type of aspect. When weighting is disabled, the waveform will only show the total number of aspects on each part of the circle. When enabled, conjunctions will count more than oppositions, oppositions will count more than squares, etc. Weighting is enabled by default because this feature seems to be the one that makes the whole system work. Without it, the waveform is much less descriptive.
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