Sector Frameworks
There are numerous various methods of calculating sectors. Porphyry is our favorite method of doing it (and the method we showed you).
Porphyry
Porphyry is the default sector framework utilized at Co–Celestial sphere. At the period of birth, the precise degree of the zodiac symbol corresponding with the MC, or Midheaven — aka, at the location the highest point of the Solar body’s path through the sky (the ecliptic) intersects with the meridian — is determined, as is the precise degree of the zodiac symbol rising on the Eastern Horizon (the Ascendant).
The degree of the zodiac symbol corresponding with the MC marks the cusp of the 10th sector. The degree of the Ascendant marks the cusp of the 1st sector. The rest of the space between the MC and the Ascendant is divided into three equal parts.
The Descendant and the IC (Imum Coeli, or “bottom of the sky”) are taken to be 180° from (i.e., directly opposite) the Ascendant and the MC, respectively, and the space between them is furthermore divided into three equal parts.
Porphyry prioritizes the angles of the diagram (the Ascendant, the Descendant, the IC, and the MC) as the 1st, 7th, 4th, and 10th sector cusps, respectively, and then determines the other sectors from these. Because numerous individuals see these four angles as the majority of powerful parts of the natal diagram, they prefer to utilize the Porphyry framework rather than one like Placidus, in which the angles may fall between sectors.
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Whole Zodiac symbol
The Whole Zodiac symbol sector framework is the oldest form of sector division, and remained the preferred method of determining sectors for about a thousand years after its inception. Whole Zodiac symbol takes the entire span of the zodiac zodiac symbol that appears on the Ascendant at the period of a individual’s birth as the 1st sector. The following zodiac symbol produces up the 2nd sector, the next the 3rd sector, and so on. Entire sectors are of equal size (30°) in the Whole Zodiac symbol framework.
Whole Zodiac symbol sectors are highly easy to calculate and utilize. Additional complicated phenomena such as intercepted zodiac symbols cannot occur utilizing the Whole Zodiac symbol framework.
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Placidus
The majority of popular sector framework in utilize today is Placidus. Placidus is a period-based method of calculating the sectors that was devised during the Renaissance. It operates by marking the cusps of the sectors in two-hour increments from your period of birth. The degree of the zodiac zodiac symbol rising on the Eastern Horizon at your period of birth marks the cusp of the 1st sector. After roughly two hours, another measurement is made to see at the location that degree is now: that marks the cusp of the 12th sector. This continues for twelve hours, until the 7th sector cusp has been marked. The angles of these six sectors are then extended to produce up the angles of the six remaining sectors. Because each sector is proportioned according to the amount of period the zodiac symbols spend on the horizon from the perspective of terrestrial sphere, this generally results in sectors of unequal size. The further your birth place is from the equator, the greater the distortion of the sectors.
The Placidus framework does not function for extremely northern or southern latitudes (greater than 66°N or 66°S) because certain degrees of the zodiac rarely touch the horizon in those regions. If you were born at a latitude exceeding 66°N or 66°S, you shall not be able to calculate your diagram utilizing the Placidus sector framework.
Originally, it was popular in England, possibly because the Catholic Church banned it. It later became the default because while the underlying math is complex, it’s relatively simple to symbolize & reproduce the Placidus framework in table form.
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aspects
Alignments are special angles (like 0°, 180°, etc) between any two celestial bodies.