Aries () (meaning "ram") is the first astrological sign in the Zodiac, spanning the first 30 degrees of celestial longitude (0°= <30°). Under the tropical zodiac, the Sun transits this sign mostly between March 21 and April 20 each year. This time duration is exactly the first month of Solar Hejri calendar (Farvardin). Under the sidereal zodiac, the sun currently transits Aries from 15 April to 15 May (approximately). The symbol of the ram is based on the Chrysomallus, the flying ram that provided the Golden Fleece.