ARIES - THE FIRST SUN SIGN
Aries (meaning "ram") is the first astrological sign in the zodiac, spanning the first 30 degrees of celestial longitude. Under the tropical zodiac, the Sun transits this sign mostly from March 21 to April 19 each year. This time duration is exactly the first month of Solar Hejri calendar (Hamal/Farvardin). The symbol of the ram is based on the Chrysomallus, the flying ram that provided the Golden Fleece. Aries Zodiac sign (also called sun sign or star sign) is decided by the position of the sun at the moment of your birth, as seen from Earth. The sun takes a year to travel through the twelve Zodiac signs, but it’s not exactly a year of 365 days. The time it takes is closer to 365.25 days. That’s why we have leap years. People under the Aries sign are believed to be like a child who is frank, enthusiastic, fierce, a bit hotheaded and too loyal to their friends. Since Aries is the first astrological sign in spring during which everything comes to life, the Arians are believed to be always vigorous and passionate.
If you were born on March 20th or 21st, your sun may be on the very cusp (the starting point) of the Aries dates, or right by the end of Pisces. If you were born on the dates of 19th or 20th of April, your sun might be at the very end of Aries dates or at the cusp of Taurus.
In western astrology, Aries is a sign of initiative; a leader, with bravery, and the autonomy required to commence. Uncomfortable with inaction, Aries is the Cardinal sign of Fire, and thus is the zodiac of drive. Ruled by Mars, Aries is strongly autonomous, and can be headstrong and crass, sometimes showing an impulsive or reckless approach to issues. With the Ram as their standard, Aries tends toward obstinate and self-seeking. Jaunty and self-supporting, Aries is capable of independence. This quality may encourage others to emulate—but Aries is unlikely to pause for supporters. When Aries is found in a chart, there is enthusiasm and decisiveness.
Every fourth year we add a day to the calendar, the 29th of February, making that year 366 days. Actually, there’s an additional rule, to make it more precise with the actual movement of earth and the sun: The starting year of a new century is not a leap year, unless it’s evenly divisible by 400. So, 1900 was not a leap year, but 2000 was.
The leap years make the dates of each Zodiac sign change slightly. Normally, Aries dates start on March 21 and end on April 19, but that’s just the mean. In reality it changes slightly in a four year period from one leap year to the next.