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Free calculator · Astrology

Mars Sign Calculator

Your Mars sign is the sign of the zodiac Mars stood in when you were born. Mars takes just under two years through the zodiac and mostly stays a good six weeks in a sign, many months when retrograde. The calculator works it out the way the UmbraLux app does, to the arcminute.

Date of birth

As exact as you can, ideally from your birth certificate.

Your place is missing? Take the nearest town; a few kilometres hardly change the result.

The calculation runs in your browser. Your birth data is neither sent nor stored; only this device remembers your last entry. · Place data: GeoNames (CC BY 4.0)

How the Mars sign is calculated

The calculator runs the same calculation as the UmbraLux app, in three steps:

  1. 1

    Turn the clock time into Universal Time

    Your birth time is the clock time at your birthplace. With the time zone that applied there on that day (the IANA time zone database knows summer times and older rules), it becomes Universal Time (UTC). Without a time, the calculator takes your whole birthday at your birthplace.

  2. 2

    Calculate the position of Mars

    For that moment the ephemeris gives the apparent geocentric longitude of Mars on the ecliptic of date: where Mars stood in the zodiac, seen from the Earth.

  3. 3

    Read the sign

    The longitude divided by 30° gives the sign: 0° to 30° is Aries, 30° to 60° Taurus and so on (tropical zodiac). The remainder is the degree within the sign.

Example: 15 May 1990, 14:30, Berlin

On 15 May 1990 summer time applied in Berlin (UTC+2), so 14:30 was 12:30 Universal Time. At that moment Mars stood at 18°20′ Pisces.

Mars had entered Pisces on 21 April 1990 and left it on 31 May 1990: anyone born in that time has Mars in Pisces.

What the Mars sign means in astrology

Astrology reads Mars as your drive: how you act, assert yourself, fight and use your strength.

In the library

Questions about the Mars sign

How long does Mars stay in a sign?

Mostly a good six weeks (45 days at the median). In the years it turns retrograde it stays up to 235 days, almost eight months, in the same sign (calculated for 1900 to 2100).

What does a retrograde Mars at birth mean?

About every 25 months Mars seems to move backwards, seen from the Earth, for 60 to 81 days; it is retrograde at just under one birth in ten. Astrology reads it as inward, considered strength. The calculator shows whether Mars was retrograde at your birth.

How accurate is the calculator?

In 5,000 samples from 1900 to 2100 Mars lay two arcseconds on average and eleven at most from a calculation on the Swiss Ephemeris.

Is my data stored?

No. The calculation runs in your browser; your date, time and place are neither sent nor stored. Only your device remembers your last entry, and you can delete it below the form.

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