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Fire · Cardinal

Aries

The Ram, the 1st sign of the zodiac year, usually printed as 21 March – 19 April.

A hand-coloured star card of Aries: a woolly ram with curled golden horns lying with its legs folded, the stars of the constellation pricked through its body, and a blue-green blowfly (Musca Borealis) above it.
Aries and Musca Borealis · Sidney Hall · Urania's Mirror; or, A View of the Heavens, London, 1825
Element
Fireenergy, initiative and self-assertion, in the tradition
Modality
Cardinalthe signs that open a season, traditionally read as initiators
Traditional ruler
MarsAssigned before the outer planets were found
Modern ruler
MarsSame as the traditional ruler.

When the sun actually crosses

The moment the sun enters Aries and the moment it leaves for Taurus, each year from 2015 to 2026, in UTC to the minute.

20 Mar 00:0020 Mar 06:0020 Mar 12:0020 Mar 18:0021 Mar 00:0020122016202020242010202620 Mar 00:0020 Mar 06:0020 Mar 12:0020 Mar 18:0021 Mar 00:00201220162020202420102026
Where the sun crossed into Aries, 2010–2026, in UTC. The marked years are the ones where a 29 February has fallen in between and pulled it back by most of a day.
YearSun enters AriesSun leaves for Taurus
201520 March, 22:45 UTC20 April, 09:42 UTC
201620 March, 04:30 UTC19 April, 15:29 UTC
201720 March, 10:29 UTC19 April, 21:27 UTC
201820 March, 16:15 UTC20 April, 03:12 UTC
201920 March, 21:58 UTC20 April, 08:55 UTC
202020 March, 03:50 UTC19 April, 14:46 UTC
202120 March, 09:37 UTC19 April, 20:33 UTC
202220 March, 15:33 UTC20 April, 02:24 UTC
202320 March, 21:24 UTC20 April, 08:13 UTC
202420 March, 03:06 UTC19 April, 14:00 UTC
202520 March, 09:01 UTC19 April, 19:56 UTC
202620 March, 14:46 UTC20 April, 01:39 UTC

VSOP87, checked against published equinox and solstice times.

Which dates can be Aries

Since 1920 the sun has entered Aries on 20 March or 21 March, and left it for Taurus on 19 April, 20 April or 21 April (UTC). On those dates the sign depends on the year, and in a crossing year on the hour; each date's page gives every year.

In the tradition

In Western astrological tradition, Aries is classed as a cardinal fire sign. Cardinal signs are the signs that open a season, traditionally read as initiators, and fire signs are traditionally associated with energy, initiative and self-assertion. Its ruling planet in that tradition is Mars.

These are associations reported from tradition, not claims about anyone born under the sign.

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