Your Thai birth day

The place is here because Wednesday is split at sunset and the day turns at dawn, and both are real events rather than clock times. If you were not born on a Wednesday and not in the hours before sunrise, neither one changes your answer.

Two eight-day weeks, one important difference

Thailand and Myanmar both count eight days, and both do it by splitting Wednesday and giving the second half to Rahu, the shadow point inherited from Indian astrology. Put the two systems side by side and they look like one system with different vocabulary.

They are not. Burmese practice splits Wednesday at noon. Thai practice splits it at sunset. That leaves six hours of every Wednesday, roughly midday to dusk, where the two traditions disagree about which planet you belong to, which Buddha image is yours, and which letters your name should avoid. Anyone born in that window who has read both will have been given two answers. Our Burmese page uses noon because that is what Burmese practice uses, and this page uses sunset for the same reason. Neither is a correction of the other.

Because sunset is a real event rather than a clock time, this asks where you were born. It moves about forty minutes across the year inside Thailand and is two hours later again in a northern European summer, so a fixed six o’clock would be wrong for most of the people who ask.

Wednesday

Sunset at the place of birth, not noon. Thai practice splits Wednesday into พุธกลางวัน (Mercury) before sunset and พุธกลางคืน (Rahu) after it. The Burmese eight-day week splits Wednesday at noon instead, and the two traditions are not interchangeable

The day itself

Sunrise. In Thai reckoning the day turns at dawn, so a birth between midnight and sunrise belongs to the previous weekday. Popular usage often just takes the calendar weekday, so where the two disagree this shows both and names which is which

Maha Thaksa

The eight houses are placed by starting the บริวาร house at the birth-day planet and running the fixed Thaksa wheel from there. The wheel order is Sun, Moon, Mars, Mercury, Saturn, Jupiter, Rahu, Venus, which is the order of the eight directions, not the order of the week

Not computed

The sidereal chart a mor du would also cast, the twelve-year Naga cycle, and the lek chet tua number square. This page is the birth-day layer, which is the part of Thai astrology in everyday use

The eight days, their colours and their images

The postures are episodes from the Buddha’s life rather than symbols invented for a calendar, which is why the row in a temple reads as religion instead of astrology even though it is indexed by a planetary week. Saturday’s is worth pausing on: the Naga sheltering the Buddha from seven days of rain is the same serpent that replaces the Dragon in the Thai twelve-year cycle.

The wheel that decides what you can be called

Maha Thaksa is the layer under the colours. It arranges the eight planets around the eight directions in a fixed wheel, and then rotates the eight houses onto it so that the first house, Boriwan, always starts at your own birth planet. That one rotation is the whole system: it is why two people born on different days have completely different maps of the same eight directions.

The wheel is not the order of the week, which catches people out. It runs Sun, Moon, Mars, Mercury, Saturn, Jupiter, Rahu, Venus, because it is really the order of the compass: northeast, east, southeast, south, southwest, west, northwest, north.

Kalakini, and why Thai names look the way they do

The eighth house is กาลกิณี, misfortune, and it is the piece of this most Thai people can name about themselves. Each planet governs a group of Thai consonants, so the planet that lands in your eighth house governs a set of letters, and a name for someone born on your day traditionally starts with none of them. The favourable letters come from the Si and Det houses instead.

That is the same move Burmese naming makes, and it is why both traditions matter to a site called AsterNym. Almost everywhere else the tie between a name and a birth moment is something a reader interprets afterwards. Here it is a rule that was applied before you could object, and it is still applied: parents consult a monk or an almanac, and formal Thai given names are frequently chosen this way rather than for how they sound.

What this page does not do is cast the sidereal chart a mor du would also draw, or run the twelve-year Naga cycle. AsterNym explores these as cultural and metaphysical traditions, not scientific predictions.