Zodiac Calendar Calculator
Zodiac sign
Aries
Zodiac Sign Calculator
Sign glyph
♈
Conventional sign range
03-21..04-19
Calculation basis
Conventional fixed civil-date ranges, not an ephemeris longitude and not an IAU constellation boundary.
Element
Fire
Modality
Cardinal
Ruling planet
Mars
Polarity
Positive (masculine/diurnal)
Days from the nearest sign boundary
0
Within a day of a boundary
Yes - within one day of a sign boundary
Worked out from Claudius Ptolemy, Tetrabiblos, Book I (translated F. E. Robbins, Loeb Classical Library 435) and 1 other source.
Fixed date ranges are the conventional approximation. The Sun actually crosses each 30-degree boundary at a moment that moves by up to about 36 hours across the leap-year cycle.
A birth on 03-21 is within a day of the Aries boundary; only a chart computed from the Sun's true ecliptic longitude at the birth time settles the sign.
For entertainment and cultural interest. Astrology and numerology are traditional practices with no scientific basis for predicting events or describing a person; do not use them for health, financial or legal decisions.
How this is worked out
4 steps
- Parsed 2000-03-21 as a Gregorian date: month 3, day 21.
- Matched month-day 03-21 against the twelve inclusive conventional ranges.
- 03-21 falls inside 03-21..04-19, which is Aries.
- Aries is a cardinal fire sign ruled by Mars.
All twelve conventional rangestable
| sign | range | element | modality | ruler |
|---|---|---|---|---|
| Capricorn | 12-22..01-19 | Earth | Cardinal | Saturn |
| Aquarius | 01-20..02-18 | Air | Fixed | Saturn (modern Uranus) |
| Pisces | 02-19..03-20 | Water | Mutable | Jupiter (modern Neptune) |
| Aries | 03-21..04-19 | Fire | Cardinal | Mars |
| Taurus | 04-20..05-20 | Earth | Fixed | Venus |
| Gemini | 05-21..06-20 | Air | Mutable | Mercury |
| Cancer | 06-21..07-22 | Water | Cardinal | Moon |
| Leo | 07-23..08-22 | Fire | Fixed | Sun |
| Virgo | 08-23..09-22 | Earth | Mutable | Mercury |
| Libra | 09-23..10-22 | Air | Cardinal | Venus |
| Scorpio | 10-23..11-21 | Water | Fixed | Mars (modern Pluto) |
| Sagittarius | 11-22..12-21 | Fire | Mutable | Jupiter |
Results are general information, not financial, tax, legal, medical or engineering advice.