How the day sign is calculated
Every calendar date has a Julian Day Number, a plain count of days. The Maya creation date 4 Ajaw 8 Kumk'u corresponds to Julian Day 584283 under the correlation that Goodman, Martinez and Thompson established from colonial records and that agrees with the count kept in the Guatemalan highlands to this day. From there the arithmetic is fixed: the number advances by one each day and wraps at thirteen, the day sign advances by one and wraps at twenty, and the two together give a kin number from 1 (1 Imix) to 260 (13 Ajaw). The calculator applies exactly this to your civil birth date. Because the Maya day was reckoned from sunrise, a birth before dawn may belong to the previous kin — the card says so.
The twenty day signs
The signs run Imix (the crocodile, primal nourishment), Ik' (wind, breath and speech), Ak'bal (night and the house), K'an (seed and net), Chikchan (serpent, life-force), Kimi (death and the ancestors), Manik' (deer, the hand and authority), Lamat (star, rabbit, abundance), Muluk (water and offering), Ok (dog, loyalty and law), Chuwen (monkey, the weaver of time), Eb (the road and the traveller), Ben (reed, corn, the home), Ix (jaguar, earth magic), Men (eagle, vision and prosperity), Kib (owl, forgiveness), Kaban (earth and knowledge), Etz'nab (flint knife, truth), Kawak (storm, community) and Ajaw (the sun lord). The result card shows your sign in both the Yucatec spelling used in scholarship and the K'iche' name used by the day-keepers — Imox, Iq', Aq'ab'al, K'at, Kan, Kame, Kej, Q'anil, Toj, Tz'i', B'atz', E, Aj, I'x, Tz'ikin, Ajmaq, No'j, Tijax, Kawoq, Ajpu — together with its direction, colour and meaning.
The thirteen numbers
The number attached to your sign is its strength. Day-keepers read the sign as the nature of the day and the number as the force with which that nature acts. The K'iche' day-keepers of Chichicastenango class the low numbers one to three as gentle days — days for giving thanks and asking favours — seven to nine as indifferent, neither gentle nor violent, and eleven to thirteen as violent, strong days for strong ceremonies (Ruth Bunzel's 1952 record, as reported in Weeks, Sachse and Prager's Maya Daykeeping); that record names no class for four to six and ten, and the card says so rather than inventing one. The names many websites attach to the numbers — Magnetic, Lunar, Electric and so on up to Cosmic — are the "galactic tones" of the 1987 Dreamspell system, not part of the Maya count, and are not used here.
Trecena, Haab and the Lord of the Night
The 260 days fall into twenty trecenas of thirteen days, each opened by a day numbered 1 whose sign colours the whole period; the card names the sign that opened your trecena. The Haab is the 365-day civil year of eighteen months of twenty days plus the five Wayeb days; your Haab date is shown for completeness, since the pairing of Tzolk'in and Haab repeats only every 52 years. The nine Lords of the Night (G1–G9) rotate through the days and are recorded on the monuments; the calculator gives yours but, honestly, their classical meanings are largely lost and the card does not over-interpret them.
Traditional count or Dreamspell?
Many websites give a different day sign for the same birthday because they use the Dreamspell count, a system created in 1987 that assigns names by a different arithmetic and skips 29 February. It is a modern invention and its day signs do not match the calendar the Maya keep. ProxaAI offers only the traditional GMT count, and if a Dreamspell result you have seen disagrees with this page, that is why. The Tibetan and Nine Star Ki calculators take the same approach: the historical reckoning, boundaries stated.
Mayan day sign inside a ProxaAI reading
Tick "Mayan Tzolk'in day sign" on your kundli and the numerologist specialist receives your number, sign, trecena and their meanings and reads them next to your numerology cycles in every question you ask — one labelled paragraph, never blended with the birth-chart planets. Users born in Mexico and Guatemala get it pre-selected together with the Western tropical chart.