Here you’ll find a number of tables that astrologers use to help them with insight in delineation of a chart and further synthesis of meaning regarding a particular part(s) of the chart.
A sign is made up of thirty degrees. Drilling down further a sign has a compliment of all the other signs which are divided up first into 3 decans of 10 degrees each of which contains a ruling planet of the sign in question and the other two signs of its same element. For example the planetary rulers of the fire element of the signs of Aries is Mars 1st decan, and the Sun 2nd decan, and Jupiter the 3rd decan. Here is a table of the planetary rulers for each decan of each sign.
SUB-SIGNS AND THE PLANETS
A sign can then be broken down into duads of 2.5° which makes up the whole 12 signs in one sign. This is once again helpful if you want to find more out precisely about the energies happening with a transiting planet at the time or an aspect it makes to another planet. This method can be used for any chart to find a planet’s sub energies by noting the sub-sign ruler that comes under the 2.5 degrees part the planet is in. Then once you have the sub sign you can find what house it is ruling in the chart you are working on, and also its ruling planet wherever that is in the chart which will yield further information about the type of energies operating in connection with that planet.
For example Uranus, maybe at 17° 20 min in the sign of Virgo in the seventh house which makes its sub sign Aries and the planet Mars the ruling sub-planet.
The astrological aspects are the angular relationship between planets and also the cusp of degrees of the houses. Sometimes they are referred to as the planets rays of different colours. The aspects are electromagnetic currents if you like that actually have an effect upon our nervous system. In another sense they are likened to the forces of the sub atomic particles in which we live and breathe and are made of. The aspects are used as a convenient way to understand better the interaction between planets, the nature of their types of energies and the different effects that occur as a result.
An aspect can be read on its own when the rays of two or more planets connect. They form when the planets concerned are within orb as in a natal chart, or come within a certain distance or orb of each other as in transits or progressions. The key to the bigger picture of aspects and how one of them fits in to the whole pattern of an aspect cycle is each aspect makes up a set of aspects which define a certain pattern of growth and maturity throughout a planets cycle from its initial beginning to the end.