Worshipping Phra Rahu is one of the most significant rituals in Thai astrology. It is especially important for those who have Rahu as their ruling planet, or for those who feel that life has been stagnant and fortune has not been on their side. According to traditional belief, Phra Rahu is the deity of darkness who governs fate and obstacles. Paying proper homage to him is believed to help reduce misfortune and restore vitality to one's life.

Who Is Phra Rahu, and Why Worship Him?

In Thai astrological texts, Phra Rahu is classified as one of the Navagraha — the nine celestial bodies. Although he is not a physical planet in astronomical terms, astrology regards Rahu as the point where the Moon's orbit intersects the ecliptic, and he is considered to exert a significant influence over human destiny.

According to Hindu mythology, as transmitted into Thai belief, Rahu was a demon who disguised himself and drank the gods' elixir of immortality. Vishnu then severed his body in two: the upper half became "Phra Rahu," and the lower half became "Phra Ketu." For this reason, sacred images of Phra Rahu typically depict only a head with a wide-open mouth and a deep black complexion. According to belief, he has a particular fondness for black objects and the number eight.

If you would like to know how strongly Rahu influences your personal horoscope, try our free fortune-telling tool as a starting point.

The Right Time to Worship Phra Rahu

According to Thai astrological belief, there are several auspicious windows for worshipping Phra Rahu, as follows.

Wednesday Evening

Wednesday is the day linked to Phra Rahu in ancient Thai texts, and Wednesday night in particular is considered his own time directly. The favoured hour is after sunset, from approximately 7:00 p.m. onward.

Rahu Hour

Every day contains a period known as "Rahu Hour," calculated from astrological tables. Tradition holds that worshipping during this window yields the greatest benefit. That said, if it is not convenient, performing the ritual on a Wednesday evening is considered entirely appropriate.

Eight Black Offerings for Phra Rahu

The heart of worshipping Phra Rahu lies in preparing eight black offerings. According to inherited tradition, the number eight is Phra Rahu's auspicious number and black is his sacred colour. Commonly used offerings include:

• Black rice or black glutinous rice — a symbol of abundance offered to him
• Black sesame seeds — an offering found in ancient texts, believed to be especially pleasing to him
• Black jelly — a dark-coloured sweet commonly presented in the ritual
• Black jelly cups or black sesame rice balls — modern confections that still honour the principle of black colouring
• Black or deep-purple flowers — butterfly pea flowers, dark marigolds, or any flower close to black in colour
• Black candles — lit as an offering of light within the darkness
• Black incense sticks or fragrant incense, 8 sticks — the count of eight follows his auspicious number
• Black or dark-coloured fruit — such as black grapes, young coconut, or any dark seasonal fruit

Note: Offerings may vary depending on the text and lineage of belief. Use black colouring and the number eight as your core guiding principles.

The Correct Step-by-Step Method for Worshipping Phra Rahu

To perform the worship of Phra Rahu correctly and completely according to Thai belief, follow these steps in order.

Step 1 — Purify Body, Speech, and Mind

Bathe and cleanse your body thoroughly. Wear black or dark-coloured clothing if possible. Calm your mind, reflect on what you wish to pray for, and approach the ritual with sincere intention.

Step 2 — Arrange the Offerings

Place the eight black offerings neatly on a tray or ceremonial pedestal. Light 8 incense sticks and the black candle (or a white candle if a black one is unavailable). Arrange the flowers attractively.

Step 3 — Invoke and Recite the Incantation

Recite the Namo Tassa prayer three times, then chant the devotional incantation for Phra Rahu. The most widely used chant in traditional belief is:

"Om Rahu Mahadeva Sappha Satru Vinassanti Mahalabho Bhavantume"

Recite it 8 times while holding a clear and focused intention for what you wish to request — whether it be the removal of misfortune, the strengthening of career luck, or the seeking of protection.

Step 4 — Wait for the Incense to Finish and Offer Water

Wait until all the incense sticks have burned down, then offer one glass of clean plain water before taking your leave with a respectful bow. The offerings that have been presented may be shared with others or consumed yourself — they are not considered forbidden.

Precautions and Things to Avoid

According to inherited belief, there are certain practices that should be avoided on the day of worshipping Phra Rahu, including:

• Avoid using coarse language, quarrelling, or giving in to intense anger
• Do not perform the ritual when your body is unclean or your mind is unsettled
• Some lineages recommend abstaining from meat on the day of the ritual, though this is not a strict requirement
• Do not perform the ritual out of greed or with the intention of causing harm to others

If you would like guidance tailored specifically to your personal horoscope, you can consult directly with our specialist astrologers to determine which time is most auspicious for performing the ritual in alignment with Rahu's position in your own birth chart.

Frequently Asked Questions About Worshipping Phra Rahu

Is it necessary to worship Phra Rahu every week?

According to Thai belief, there is no fixed rule requiring weekly worship. Those who practise regularly tend to do so once a month on a Wednesday, or whenever they feel their fortune is stagnant, obstacles are mounting, or Rahu is transiting a significant position in their birth chart.

Which day of birth makes worshipping Phra Rahu especially important?

According to Thai astrological texts, those who should pay particular attention to worshipping Phra Rahu include people who have Rahu as their ruling planet, those with Rahu placed in a significant position in their birth chart, and those currently in a period when Rahu is approaching a key point in their chart. That said, anyone may perform the worship regardless of their day of birth. If you would like to know the details of your own horoscope, we recommend subscribing to your personal daily horoscope to keep track of your auspicious periods on an ongoing basis.

Can I still worship if I cannot find all eight black items?

Many astrologers advise that the most important element is sincere intention, not a complete set of offerings. If you cannot gather everything, use what you have, keeping black colouring and a quantity that is eight or a multiple of eight as your guide. Faith and a pure heart are considered far more important than an elaborate array of offerings.

The worship of Phra Rahu is a ritual that reflects the wisdom and beliefs of the Thai people, passed down through generations. Whether viewed through a psychological lens or through the eyes of faith, performing the ritual with genuine intention and respect helps cultivate inner calm and readiness to face life's obstacles. May all who practise with a pure heart find the blessings they seek.