The Zodiac signs are equally spaced around the horoscope, at 30 degrees each. Houses are calculated using the system on the left; some are narrow and some are wide. If the location of your birth is close to the equator, the houses will be close to 30 degrees each, and relatively equal in size. But the further you go towards the North or South pole, the more extreme they’ll be in size.
For this reason, most of the time the house and sign cusps alternate, but if you live far from the equator you’ll have zodiac signs and houses that are intercepted in your chart. An intercepted sign is when a big house contains the entire sign. An intercepted house is when the same zodiac sign falls on two narrow house cusps. In this type of chart, you will always have two opposite intercepted signs and two opposite intercepted houses.
Intercepted signs take on increased importance because they cover extra territory, and affect more areas of your life. Intercepted houses show us some of the ways we can get around the difficulties caused by our intercepted signs.