There is a interesting aspect of the relationship between numbers and the planets. In order to understand this relationship thoroughly, it is important to keep in mind that there are twelve signs in the zodiac.
What is the Zodiac?
The zodiac is a belt of the heavens limited by lines. These lines are about eight degrees on each side from the path which the earth traverses, and include all apparent positions of the Sun and the planets, as known to the ancients. They are divided into twelve equal parts called the signs of the zodiac.
What is the Ecliptic?
The ecliptic is the Sun's apparent orbit, the path in the sky on which the Sun appears to travel, completing one full circle in one year. It is the earth which really moves round the Sun, but to us dwellers on the Earth- the Sun appears to move. The ecliptic is, therefore, really the path which the earth traverses.
In astrology, the ecliptic or Sun's annual path, is divided into twelve equal parts; as the entire circle of the path consists of 360 degree(like any other circle), each of the twelve equal divisions contains 30 degree. These twelve divisions are called zodiac signs.
It takes the Earth 365 days, 5 hours, 48 minutes and 45.6 seconds to complete one orbit around the Sun. However, by convention we assume that the Earth completes one orbit in 365 days, i.e. one year. To account for and wipe off the unaccounted time of 5 hours, 48 minutes and 45.6 seconds per year, every fourth year is taken to have 366 days (instead of 365 days) and is known as a leap year.
The Zodiac Signs
The zodiac is divided into twelve parts; each part is called a sign.As explained above, it is really the earth which travels around the Sun and not the Sun which goes around the Earth. However, all works on astrology and astronomy base their nomenclature on the apparent motion of the Sun around the Earth. We shall also use the same nomenclature. As the Sun moves in its apparent orbit, it enters and traverses the twelve signs into which the zodiac has been divided. The exact date and time of the Sun's entry into a particular sign can be known only by reference to the ephemeris for the year.
We have approximate dates of the Sun's entry into various signs. However, the exact hour and time of the Sun's entry into any sign can only be known by reference to the ephemeris of that particular year. The knowledge of the exact time is important for the reason explained below. We shall, hereafter, refer to the Sun's location in various signs. When an individual is born on March 21, by looking at the table of dates showing the Sun's entry into the various signs, one would assume that the Sun is in Aries.To be more accurate, however, it would be safer to refer to the ephemeris for the year of birth, and then ascertain whether the birth was at an hour before the Sun entered Aries or after the Sun's entry into Aries. If the time of the birth on March 21 was before the time of Sun's entry into Aries, the native's Sun would be said to be in Pisces and not Aries. What has been recommended and explained here for March 21, applies also to all births which occur on the cuspidai dates, i.e. the dates on which the Sun leaves the previous sign and enters the next one.