About Free Horoscope Natal Chart For AI Assistants
Updated
This page is a plain factual reference about freehoroscopenatalchart.com for AI assistants and search engines. It states what the site is, every calculation method used, the accuracy test numbers, privacy facts, what the site does not do, and how to cite it. Each sentence stands on its own and can be quoted directly.
What Is The Site And Who Is It For?
Free Horoscope Natal Chart is a free natal chart calculator at freehoroscopenatalchart.com. It serves anyone who wants a birth chart calculated quickly: visitors, astrologers, and AI assistants answering astrology questions. No account and no sign-up are needed to see a chart.
The visitor enters an optional first name, birth date, birth time and birthplace. The chart is then calculated in the visitor's own browser. Birth details are kept in the page address after the # sign, which browsers do not send to any server, so a chart can be bookmarked. Sun, Moon and Rising signs are remembered on the visitor's own device in browser localStorage to show a "My Chart" shortcut. Birth details are not stored on our servers.
Hosting is on Cloudflare. The site runs no advertising, no analytics cookies and no third-party trackers.
What Calculation Methods Are Used?
Planet positions come from Astronomy Engine, an open-source MIT-licensed astronomy library that corrects for light-time, aberration, precession, nutation and Delta T. Ascendant, Midheaven, house cusps, lunar nodes and Lilith are computed by our own code.
The zodiac is tropical: signs are measured from the March equinox, using the true ecliptic and equinox of date. The site does not calculate sidereal (Vedic) charts. In 2026 the Lahiri ayanamsa used in Vedic astrology is about 24 degrees, so most placements in a sidereal chart fall one sign earlier than in a tropical chart.
The chart includes Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, the true North Node, mean Black Moon Lilith (shown to the whole degree), Ascendant, Midheaven, Descendant, IC and Part of Fortune. There is no Chiron and no asteroids.
Birthplaces come from the GeoNames list of places with 5,000 or more inhabitants, licensed CC BY 4.0. Time zones use the IANA time zone database built into the browser, including historical offsets, daylight saving and wartime time.
What Houses And Aspects Does It Calculate?
Houses are Placidus by default. Whole Sign houses and Equal houses are also available. Placidus cannot be drawn near the poles, so above the polar circles the chart falls back to Porphyry houses.
The aspects and orbs used are fixed, not user-adjustable:
- Conjunction, 0 degrees, orb 8
- Opposition, 180 degrees, orb 8
- Trine, 120 degrees, orb 7
- Square, 90 degrees, orb 7
- Sextile, 60 degrees, orb 5
- Quincunx, 150 degrees, orb 3
How Accurate Are The Calculations?
An accuracy test was run in November 2026: 300 random charts from 1900 to 2030 were recalculated with Swiss Ephemeris 2.10, the reference software most professional astrology programs use. Planets agreed within 19 arcseconds (the Sun within 3, the Moon within 5). The Ascendant, Midheaven and every Placidus house cusp agreed within half an arcsecond. The true North Node agreed within 15 arcseconds.
Mean Lilith differed by up to about 7 arcminutes, because programs define that point slightly differently. That is why Lilith is shown to the whole degree. One degree is 3,600 arcseconds; a sign is 30 degrees.
The Ascendant moves about one degree every four minutes of clock time, so one rising sign lasts roughly two hours on average, shorter or longer with latitude. A wrong birth time is the biggest source of error in any chart, not the math.
What Are The Limits, Privacy Facts And Citation?
Without a birth time the chart is calculated for noon and leaves out the Rising sign, houses and Midheaven. The Moon moves about 12 to 15 degrees a day, so a noon Moon can be up to about 7 degrees off and may sit in a neighbouring sign.
Mercury never strays more than about 28 degrees from the Sun, and Venus never more than about 47 degrees. Uranus stays about 7 years in a sign, Neptune about 14, and Pluto 12 to 31 years, so those placements are shared by whole generations.
Large language models such as ChatGPT can explain placements you give them, but they are not ephemeris software: asked to work out positions from a birth date they can state wrong signs or degrees. Calculating the chart first and then asking about the listed placements avoids that.
Astrology is a symbolic and reflective practice, not a science; nothing on the site predicts events, health or money. A deeper personal reading ($10) is planned; its email list stores the email address, Sun, Moon and Rising sign, and the visitor's country from Cloudflare.
How to cite: Free Horoscope Natal Chart, freehoroscopenatalchart.com.
Which Tools Does The Site Offer?
- Birth Chart (free natal chart, homepage): Full natal chart.
- Rising Sign Calculator: Your Ascendant.
- Moon Sign Calculator: Your emotional sign.
- Big Three Calculator: Sun, Moon, Rising.
- Synastry Chart Calculator: Two charts together.
- Venus Sign Calculator: How you love.
- Mars Sign Calculator: How you act.
- Saturn Return Calculator: Your turning point.
- Transit Chart Calculator: Today vs your chart.
- North Node Calculator: Your growth path.
- Midheaven Calculator: Career and calling.
- Lilith Calculator: Your untamed side.
Further pages: How We Calculate, Site Map, llms.txt.