byjove,
I'm sorry but it's only with your own studies and research, using transits progressions to house cusps may this sheds some light... you just have to see 'which glove fits' and go with that.
http://en.wikipedia.org/wiki/Equal_house_system#Equal_House
The earliest systems (whole sign and equal house) linked the houses to the signs of the zodiac. The equal house system defines houses as 30-degree sectors of the ecliptic, so that the cusp of each house falls on the same degree of each zodiac sign. One outcome of this is that a varying angle occurs between the ascendant and midheaven in higher latitudes. Attempts to reconcile the concept of "quadrants" with the varying angle between midheaven and ascendant lead to more complicated house systems. These became more relevant as astrology spread from subtropical regions to higher latitudes.
Goals for a house system include ease of computation; agreement with the "quadrant" concept (ascendant on the first house cusp, nadir on the fourth, descendant on the seventh, and midheaven on the tenth); defined and meaningful behaviour in the polar regions; acceptable handling of heavenly bodies of high latitude (a distinct problem from high-latitude locations on the Earth's surface); and symbolic value. It is impossible for any system to satisfy all the criteria completely, so each one represents a different compromise. The extremely popular Placidus and Koch systems, in particular, can generate undefined results in the polar circles.
Research and debate on the merits of different house systems is ongoing.
Equal House
In the equal house system the
ecliptic is also divided into twelve divisions of 30 degrees, although the houses are measured out in 30 degree increments starting from the degree of the ascendant. It begins with the ascendant, which acts as the 'cusp' or starting point of the 1st house, then the second house begins exactly 30 degrees later in zodiacal order, then the third house begins exactly 30 degrees later in zodiacal order from the 2nd house, and so on.
The MC in Whole Sign & Equal House Systems
In the whole sign and equal house systems the Medium Coeli (
Midheaven), the highest point in the chart, does not act as the cusp or starting point of the 10th house. Instead the MC moves around the top half of the chart, and can land anywhere in the 7th, 8th, 9th, 10th, 11th, 12th, depending on the latitude.
The MC retains its commonly agreed significations, but it doesn't act as the starting point of the 10th house, therefore in Equal house it adds extra definition and meaning to MC and the cusps involved, but always MC is same in interpretations as other house systems.
You can read up on all the other house systems via the link