LunaYour data carries over - Luna reads the chart aloud
The sign is a headline. How the Sun actually sounds together with the Moon, the ascendant and the houses is what Luna reads from the full chart.
Read my chartCusp birthdays: why date tables get it wrong
The Sun does not switch signs on a magazine schedule: the border drifts a day or two from year to year and depends on the birthplace’s time zone. For birthdays around the 19th–23rd a table like “May 21 is already Gemini” can name the neighbouring sign. The only honest answer is calculating the Sun’s position for the actual moment of birth - which is what the calculator above does. And “on the cusp” does not mean “two signs”: the Sun always stands in exactly one sign; near the border its theme is merely tinted by the neighbour.
Sun sign dates, computed: the earliest and latest each sign can start
Instead of one more averaged table, here is the real spread. Every ingress of the Sun from 1960 to 2029 was solved from the ephemerides, and these are the extremes - the earliest and the latest moment each sign has begun in those seventy years, in UTC.
| Sign | Earliest start (UTC) | Latest start (UTC) |
|---|---|---|
| Aries | 20 March 02:17 | 21 March 08:20 |
| Taurus | 19 April 13:10 | 20 April 19:36 |
| Gemini | 20 May 12:10 | 21 May 18:58 |
| Cancer | 20 June 20:02 | 22 June 03:04 |
| Leo | 22 July 06:54 | 23 July 13:59 |
| Virgo | 22 August 14:01 | 23 August 20:58 |
| Libra | 22 September 11:45 | 23 September 18:23 |
| Scorpio | 22 October 21:13 | 24 October 03:29 |
| Sagittarius | 21 November 18:54 | 23 November 00:49 |
| Capricorn | 21 December 08:20 | 22 December 14:02 |
| Aquarius | 19 January 19:01 | 21 January 01:10 |
| Pisces | 18 February 09:08 | 19 February 15:26 |
Read the gap, not the dates. Every sign has a window of roughly thirty hours, which is why one magazine prints “Aries from 21 March” and another “from 20 March” and neither is lying. Add your own time zone on top and the window widens further: a birth in Sydney and a birth in Los Angeles on the same calendar date can land on opposite sides of it. Cancer, Scorpio, Sagittarius and Aquarius are the awkward ones - their start lands on three different calendar dates across the period.
All of which is a long way of saying that a date table cannot answer a cusp birthday, and a calculation can. That is what the form at the top of this page is for, and it takes a date rather than an account.
The Sun in each sign
- ♈Aries
The Sun in Aries is a start-of-things placement: it is at its best in the moment a thing begins - the call placed, the door opened, the honest sentence said out loud. Waiting is the hard part, not the doing. Courage here is standard equipment rather than a performance.
- ♉Taurus
A Taurus Sun treats slow as a strategy. It wants a life you can put your hands on: real food, paid bills, people who are still around in November. It builds rather than announces, and it treats comfort and loyalty as serious work rather than as rewards.
- ♊Gemini
With the Sun in Gemini the mind runs like a switchboard - ideas in, ideas out, everyone connected to somebody useful. This Sun needs range, and makes dull material interesting by talking it through with another person. Boredom hurts more here than failure does.
- ♋Cancer
A Cancer Sun organises a whole life around the chosen few: the door left unlocked, the pot on the stove, a long memory for who needed what and when. It considers all of that ordinary rather than generous, which is precisely why people lean on it.
- ♌Leo
The Sun in Leo is warmth with the lights on. It makes things and needs them to land somewhere - the table set for people who actually came, the work signed, the friend told plainly that they matter. Play is not a break from the method here; it is the method.
- ♍Virgo
A Virgo Sun shows care as competence. It spots the loose screw, the wrong word, the thing that will fail by spring - then fixes it, usually without mentioning it. Craft is where the fire actually lives, and the fixing is the affection.
- ♎Libra
The Sun in Libra feels fairness physically: a lopsided room stays uncomfortable until somebody straightens it. This Sun wakes up across from another person and keeps finding the third option two arguers cannot see. Beauty runs on that same circuit.
- ♏Scorpio
A Scorpio Sun is built around depth as an appetite - work worth going all in on, trust with no backup plan, conversations that get past the weather. It would rather hold one honest thing than ten pleasant ones, and it can tell the difference instantly.
- ♐Sagittarius
The Sun in Sagittarius puts meaning first and comfort second. It needs room: a road, a question, a belief worth testing against reality. Hand it a pointless task and it tires within the hour; hand it a reason and it will carry weight for years.
- ♑Capricorn
A Capricorn Sun plays the long game, and plays it clean. It keeps climbing the slope other people abandoned in month three, and it takes real strength from its own discipline. Reliability is not dullness here - it compounds, quietly, for decades.
- ♒Aquarius
The Sun in Aquarius starts by asking why the rule exists. It runs on independent thought and a stubborn fondness for the future, and watching anyone get flattened into being convenient genuinely bothers it. Friendship counts for more here than approval.
- ♓Pisces
A Pisces Sun gets the feeling well before the explanation. It is unusually permeable to other people and turns what it picks up into music, images, or simple company on somebody’s bad week. Imagination is closer to breathing than to hobby.
Frequently asked questions
Born on the 21st, right on the border - which sign am I really?
It depends on the year, time and place of birth: the border drifts. The calculator above computes the Sun’s exact degree, which settles it. If the time is unknown, cusp birthdays are worth checking with at least “morning” or “evening”.
Why do different horoscopes give different sign dates?
Date tables are averages over many years, and every publication averages differently. The exact border is astronomical: the moment the Sun enters the sign in that specific year.
How is the sun sign different from the ascendant?
The Sun is essence and direction; the ascendant is presentation and first impression. That is why people of the same sun sign come across so differently - their ascendants differ.
I am nothing like my zodiac sign. Is that normal?
Completely. The Sun is only a third of the big three: the Moon and the ascendant can sound louder, especially day to day and in first meetings. The full picture comes from the whole chart, not one sign.
Calculating the points is astronomy; interpreting them is a symbolic system for self-reflection, not science.
The Sun is only a third of the big three
Character is built from the Sun, the Moon and the ascendant - plus houses and aspects. Luna builds the full chart from real ephemerides and tells what matters in plain words.
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