Tithi in Vedic Astrology: Complete Guide to Lunar Days, Ekadashi & Moon Phases

Key Takeaways:

• Tithi = a 12° angular gap between the Moon and the Sun; one lunar day lasts 19–26 hours — not 24
• 30 tithis per lunar month: 15 in Shukla Paksha (waxing) + 15 in Krishna Paksha (waning)
• 5 tithi categories — Nanda, Bhadra, Jaya, Rikta (avoid all auspicious work), Poorna — govern activity suitability
• Ekadashi (11th tithi) is the most sacred lunar day for fasting and spiritual practice
• Abhijit Muhurta (midday window, ~11:36–12:24 local time) neutralizes any unfavorable tithi except Wednesdays
• Tithi is universal — the same moment worldwide; Vara and Hora are local, calculated from local sunrise

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What Is Tithi? The 12-Degree Formula Behind Every Lunar Day

At the heart of every Panchang system lies one deceptively simple rule: when the Moon moves 12° ahead of the Sun, one tithi — one lunar day — has elapsed.

The classical formula, stated identically in B.V. Raman's Muhurtha and P.V.R. Narasimha Rao's Vedic Astrology: An Integrated Approach, is:

(Moon longitude − Sun longitude) ÷ 12 = quotient with remainder Tithi number = quotient + 1

For example: Moon at 85°, Sun at 22° → difference is 63°. Divide by 12: quotient 5, remainder 3. Tithi = 5 + 1 = 6th Tithi (Shashthi).

This is not approximate — every panchang in use today runs this calculation continuously, with the tithi number updating the moment the Moon crosses the next 12° threshold.

Why a Lunar Day Is Not 24 Hours

This is where tithi fundamentally diverges from the solar day. The Moon's orbital speed varies due to the elliptical shape of its orbit:

• Perigee (Moon close to Earth): fastest — covers 12° in roughly 19 hours
• Apogee (Moon far from Earth): slowest — covers 12° in roughly 26 hours

The practical consequence: some solar days contain two tithis (one ends before midnight, another begins and concludes within the same date), and some tithis span two solar days (Vriddhi Tithi). Occasionally — when the Moon moves exceptionally fast — a tithi occurs entirely overnight and is never "present" at sunrise: this is a Kshaya Tithi (skipped day).

Calculating the Exact Moment of Tithi Change

B.V. Raman provides the formula for timing the tithi transition in Muhurtha:

Time remaining = (12 − remainder) ÷ diurnal motion of the Moon

The remainder is what was left from the longitude division; the diurnal motion is the Moon's current speed for that day. The result gives time in days — fractions convert to hours and minutes — until the current tithi ends and the next begins.

The ancient Surya Siddhanta underpins all these calculations with a minute time-division system: 6 pranas = 1 vinadi, 60 vinadis = 1 nadi, 60 nadis = 1 complete day-night cycle.

This precision matters critically for muhurta selection. An auspicious tithi ending at noon cannot rescue a ceremony scheduled for the evening — the window is gone.

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Shukla Paksha and Krishna Paksha: The Two Energies of the Moon

The 30 tithis of the lunar month divide into two pakshas (fortnights) based on the growing or shrinking Sun-Moon arc:

Paksha	Tithis	Sun–Moon Angle	Moon Phase	Dosha (P.V.R. Rao)
Shukla Paksha	1–15	0° → 180°	New → Full Moon	Kapha (building)
Krishna Paksha	16–30	180° → 360°	Full → New Moon	Vata (releasing)

P.V.R. Narasimha Rao (Lesson 152) maps the two extreme tithis directly to Ayurvedic constitutions:

• Purnima (Full Moon, 15th Shukla tithi): Kapha energy — full, watery, nourishing. The body retains more fluid, tissue is at maximum saturation, and immunity peaks. Ancient physicians noted that surgeries performed around Purnima carry elevated bleeding risk due to this fluid excess. Fasting at Purnima helps balance the Kapha overload.

• Amavasya (New Moon, 30th tithi): Vata energy — dry, cool, airy. The nervous system is maximally exposed. Emotional reactivity heightens, chronic conditions may flare, sleep becomes lighter. B.V. Raman observed in Muhurtha that disease crises correlate with lunar movements, particularly at the new and full moon junctions.

Practical Biohacking Framework

The waxing and waning of lunar energy maps naturally onto modern chronobiology:

• Shukla Paksha (tithis 1–15): Ideal for anabolic, building activities — starting new projects, beginning supplement protocols, increasing training loads, initiating business ventures and partnerships.

• Krishna Paksha (tithis 16–30): Ideal for catabolic, releasing activities — detox protocols, intermittent fasting, completing and closing projects, processing emotions, elective surgeries (lower bleeding risk post-Purnima).

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The 5 Types of Tithi: Nanda, Bhadra, Jaya, Rikta, Poorna

B.V. Raman's Muhurtha organizes all 30 tithis into five archetypal energy categories, each cycling through Shukla Paksha (tithis 1–15) and repeating in Krishna Paksha (16–30):

Category	Sanskrit Meaning	Tithis	Energy	Best Activities
Nanda	Joy, pleasure	1, 6, 11	Creative, celebratory	Arts, marketing, celebrations, new beginnings
Bhadra	Auspiciousness	2, 7, 12	Stable, foundational	Long-term contracts, stability, building
Jaya	Victory	3, 8, 13	Assertive, competitive	Competition, negotiations, sports, conflict
Rikta	Empty, void	4, 9, 14	⚠️ Depleted	Avoid all auspicious work
Poorna	Complete, full	5, 10, 15	Fulfilling, culminating	Completions, Purnima rituals, spiritual culmination

The 30th tithi (Amavasya) stands apart — it carries ancestral significance beyond any single category.

Rikta Tithi (4th, 9th, 14th): The Empty Days

Rikta means "empty" or "void" in Sanskrit. These three tithis mark the low points in lunar energy, where the Moon's beneficence is at its weakest ebb. B.V. Raman is explicit in Muhurtha:

"Rikta tithis (4th, 9th and 14th) are to be avoided for all auspicious works."

The practical impact across life domains:

• Weddings: Marriages begun on Rikta days carry elevated risk of discord, separation, or persistent conflict.
• Business launches: Companies and partnerships initiated on Rikta days face early structural obstacles; require re-founding or major pivots.
• Medical procedures: Elective surgeries on Rikta tithis show worse recovery outcomes in traditional texts; the "void" quality affects post-surgical healing.
• Financial decisions: Property purchases, large investments, and loan signings face compounding complications.

Special warning for travel: Beyond the general Rikta rule, B.V. Raman specifically flags the 8th (Ashtami) and 9th (Navami) tithis as especially dangerous for beginning journeys. Notably, Ashtami belongs to the Jaya category (generally favorable for competition) — yet it is specifically inauspicious for travel. This demonstrates that tithi quality is activity-dependent, not absolute.

How to Neutralize a Rikta Tithi

Vedic astrology is not fatalistic. B.V. Raman, citing the sage Narada, provides two reliable remedies when a Rikta tithi cannot be avoided:

1. Abhijit Muhurta — the midday window, approximately 11:36 AM to 12:24 PM local time (varies by latitude and season). This roughly 48-minute window is said to neutralize the negative quality of any tithi — with one firm exception: Wednesdays, when even Abhijit loses its remedial power.

2. Jupiter or Venus in Lagna or a strong house — if the natal chart or the election chart has Jupiter or Venus placed in the Lagna (1st house), a Kendra (1st, 4th, 7th, or 10th), or a Trine (1st, 5th, or 9th house), the Rikta effect is substantially mitigated. The benefic's presence overrides the void quality of the day.

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Ekadashi: The Sacred 11th Lunar Day — Fasting, Vishnu & Cellular Reset

Among all 30 tithis, Ekadashi holds singular status in Vedic tradition. Occurring on the 11th lunar day of both Shukla and Krishna Paksha, it appears 24 times per year (occasionally 25 in a leap lunar month) — and is universally regarded as the most spiritually potent tithi of the lunar cycle.

P.V.R. Rao identifies Ekadashi (Lessons 114–118) as an especially auspicious period for Gayatri mantra recitation, noting that the mind naturally withdraws from sensory engagement and becomes more receptive to subtle energetic influence.

According to Vedic tradition, Ekadashi is sacred to Lord Vishnu, the sustainer of the universe. The day is associated with liberation (moksha), the transcendence of material entanglement, and purification of accumulated karma.

The 24 Ekadashis: Highlights

Ekadashi	Month / Paksha	Significance
Nirjala	Jyeshtha Shukla (May–Jun)	Complete waterless fast; said to confer the merit of observing all 24 Ekadashis
Vaikunta	Margashirsha Shukla (Nov–Dec)	Most powerful; gates of Vaikunta (Vishnu's heaven) are said to open
Devuthani / Prabodhini	Kartika Shukla (Oct–Nov)	End of Chaturmas; sacred marriage season begins
Ashadhi	Ashadha Shukla (Jun–Jul)	Beginning of Chaturmas; Pandharpur pilgrimage

The Science of Ekadashi Fasting

What the tradition calls spiritual purification, modern nutritional science increasingly validates:

• Intermittent fasting (the typical Ekadashi pattern: 24–36 hours of abstention) reliably triggers cellular autophagy — the process by which cells dismantle and recycle damaged proteins and dysfunctional organelles. Autophagy research earned the 2016 Nobel Prize in Physiology or Medicine.

• Ekadashi falls 4 days after Purnima (in Krishna Paksha) and 4 days after Amavasya (in Shukla Paksha). These are the points of transition when tidal gravitational forces are shifting — traditionally identified by Ayurvedic physicians as optimal moments for digestive rest.

• The combination of Vata or Kapha correction through fasting, lunar cycle synchronization, and mantra practice creates a powerful psychophysiological reset unavailable at any other point in the lunar month.

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Planetary Rulers of Each Tithi: Your Day's Energetic Governor

According to Vedic tradition, each of the 15 tithis in Shukla Paksha carries a planetary signature that governs the quality and direction of activities on that day. The same rulers repeat in Krishna Paksha (tithis 16–30):

Tithi	Name	Ruler	Energy Quality	Best Activities
1	Pratipada	Sun	Vitality, authority, solar will	Government work, leadership, father-related matters
2	Dvitiya	Moon	Emotion, receptivity, nurture	Family, creative arts, travel (favorable), home
3	Tritiya	Mars	Drive, courage, assertiveness	Sports, competition, surgery (Jaya), new ventures
4	Chaturthi	Mercury	Communication, commerce	⚠️ Rikta — avoid auspicious work
5	Panchami	Jupiter	Wisdom, expansion, grace	Education, teaching, healing, sacred ritual
6	Shashthi	Venus	Beauty, pleasure, refinement	Arts, relationships, luxury, celebration
7	Saptami	Saturn	Discipline, karma, endurance	Long-term investments, legal matters, construction
8	Ashtami	Rahu	Disruption, shadow, intensity	⚠️ Jaya energy, but avoid travel specifically
9	Navami	Sun (2nd cycle)	Renewal of solar force	⚠️ Rikta — and especially dangerous for journeys
10	Dashami	Moon (2nd cycle)	Completion, release	Poorna quality — excellent for finalizing projects
11	Ekadashi	Vishnu / Jupiter	Liberation, transcendence	Fasting, mantra, meditation, ancestral work
12	Dvadashi	Mercury (2nd cycle)	Post-fast clarity, communication	Breaking fast, contracts, communications
13	Trayodashi	Jupiter (2nd cycle)	Blessings, expansion	Auspicious ventures, gratitude, teaching
14	Chaturdashi	Shiva / Saturn	Dissolution, transformation	⚠️ Rikta — powerful for Shaivite ritual; avoid mundane work
15	Purnima	Moon (Full)	Fullness, culmination	Poorna — spiritual culmination, celebration, completion

How to apply this: A Sun-ruled tithi (1st, 9th) favors work with authority, government, and the father-principle. A Saturn-ruled day (7th) rewards deliberate, patient action but resists impulsive decisions. The planetary ruler gives you a daily "energetic weather report" that works alongside the broader Nanda-Bhadra-Jaya-Rikta-Poorna framework.

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Amavasya: The New Moon Day and Ancestral Connection

Amavasya (the 30th tithi, or 15th of Krishna Paksha) deserves dedicated attention. When Sun and Moon conjoin, their combined gravitational pull acts along a single axis — producing maximum tidal forces and the deepest Vata state of the entire lunar cycle.

P.V.R. Rao (Lesson 152) describes Amavasya as the peak of Vata energy: the nervous system is maximally exposed, emotional sensitivity is heightened, and in Vedic cosmology the membrane between the living and the ancestral realm is at its thinnest.

Traditional Amavasya Practices

• Pitru Tarpana (ancestral water offerings): family members traditionally go to rivers, sacred tanks, or the ocean to offer water and sesame seeds to deceased ancestors, clearing karmic debt across generations
• Fasting in honor of departed relatives, with prayers at family shrines
• Silence and deep meditation: the heightened Vata sensitivity creates unusual receptivity to inner guidance

Modern Application

Amavasya is not the day for major business decisions, aggressive negotiations, or high-stimulation social events. The Vata vulnerability makes impulsive judgment more likely and emotional regulation harder. It is, however, a profound day for shadow work, processing grief and loss, releasing old patterns, and consciously resetting habits at the energetic ground floor of the lunar cycle.

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Siddha Yoga: When Day, Tithi, and Nakshatra Align Perfectly

Beyond evaluating individual tithis in isolation, classical muhurta identifies Siddha Yoga — a perfected three-way combination of weekday (vara), tithi, and nakshatra that creates an exceptionally powerful election window capable of overriding individual weaknesses.

B.V. Raman gives a specific example in Muhurtha:

Thursday + 4th Tithi (Chaturthi, a Rikta!) + Makha Nakshatra = Siddha Yoga

This is striking. Chaturthi is Rikta — normally to be avoided for all auspicious work. Yet when paired with Thursday (Jupiter's day) and Makha Nakshatra, even the "empty" quality transforms. The combination becomes siddha — accomplished, perfected, capable of overcoming its own weaknesses.

This exemplifies the core principle of Vedic muhurta: no single element is absolute. The system works through combinations, not isolated factors. A single challenging element can be overridden by sufficiently strong benefic combinations elsewhere.

The Priority Hierarchy (Narada via Raman)

B.V. Raman, citing the ancient sage Narada, establishes a definitive priority hierarchy for muhurta selection:

1. Lagna (Ascendant) — most powerful; when strong and well-placed, overrides all other considerations
2. Nakshatra — second in importance; the Moon's nakshatra position carries more weight than the tithi
3. Tithi — third
4. Vara (weekday) — fourth
5. Yoga and Karana — supporting factors that amplify or moderate

Practical implication: If you can only optimize one factor in your election chart, optimize the Lagna. A badly afflicted Lagna cannot be saved by the most auspicious tithi. Conversely, a strong Lagna can work productively even on a Rikta day.

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Kshaya and Vriddhi Tithi: Skipped and Doubled Lunar Days

Two special tithi configurations arise from the Moon's variable orbital speed and deserve special handling in muhurta planning:

Kshaya Tithi — The Skipped Day

A Kshaya Tithi (kshaya = loss, decay) occurs when a tithi begins and ends entirely within a single solar day, such that it is present at neither the preceding sunrise nor the following sunrise. The tithi is "swallowed" by the solar calendar.

According to Vedic tradition, Kshaya Tithi carries a diminished, incomplete quality — the day's energy never fully manifests. Major muhurtas should not be initiated on a Kshaya day. If your planned ceremony falls on one, shift to the adjacent day and supplement with Abhijit Muhurta.

Vriddhi Tithi — The Doubled Day

A Vriddhi Tithi (vriddhi = growth, increase) occurs when the Moon moves slowly enough that a tithi spans two full solar days — it is present at both a sunrise and the following sunrise. This is generally considered auspicious: the tithi's energy "expands" across two days, offering extended opportunity to work within its quality.

Kshaya and Vriddhi tithis occur several times per year and are clearly marked in any accurate panchang. The StarMeet Panchang calculator automatically calculates both for your geolocation.

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Muhurta Matrix: Best Tithi for Every Life Event

B.V. Raman's Muhurtha provides specific, tested tithi guidance for every major category of life event. Here is a practical consolidated matrix:

Marriage

Avoid: Rikta tithis (4th, 9th, 14th) without exception. Also avoid the 6th, 8th, and 12th tithis as a general rule for marriage.

Important exception (B.V. Raman): The 6th tithi combined with Sadhana Nakshatra becomes acceptable for marriage — demonstrating again that combinations override individual element assessments.

Favored: 2nd (Dvitiya), 3rd (Tritiya), 5th (Panchami), 7th (Saptami), 10th (Dashami), 11th (Ekadashi in rare cases), 13th (Trayodashi), 15th (Purnima).

Travel

Hard avoid (B.V. Raman, explicit): 8th (Ashtami) and 9th (Navami) tithis. These two are specifically identified as dangerous for beginning journeys.

Favorable: 2nd, 3rd, 5th, 7th, 10th, 11th, 12th, 13th tithis.

Business Launch and Contract Signing

Avoid: All Rikta tithis (4th, 9th, 14th). The "empty" quality creates structural weakness at inception.

Best for aggressive launches and competitive moves: Jaya tithis — 3rd and 13th (8th is Jaya but also avoid for travel contexts).

Best for stable partnerships and contracts: Bhadra tithis — 2nd, 7th, 12th.

Elective Surgery and Medical Procedures

Avoid: Full Moon (Purnima) and 4–5 days surrounding it. The Kapha peak means maximum tissue fluid retention, increasing surgical bleeding risk.

Best: Krishna Paksha (waning fortnight), especially 10th through 13th tithis. The body's fluid levels are at their natural low, wound healing is fastest, and recovery is cleanest.

Spiritual Practice, Fasting, and Meditation

Best: Ekadashi (11th — both Shukla and Krishna), Purnima (15th), and Amavasya (30th). P.V.R. Rao singles out Ekadashi as the most powerful period for mantra amplification; Purnima for fullness practices; Amavasya for ancestral connection and shadow integration.

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Tithi and Geolocation: Why Your Ekadashi Might Fall on a Different Day

One of the most misunderstood aspects of tithi — especially for diaspora communities — is its relationship to geography.

Tithi is universal. It is determined purely by the current astronomical positions of the Sun and Moon, which are the same from any vantage point on Earth. When the Moon crosses the 132° Sun-Moon threshold at 3 AM UTC, that transition occurs simultaneously for someone in Moscow, Mumbai, and Miami.

P.V.R. Rao addresses this directly, contrasting a practitioner in Boston with one in India: the Ekadashi tithi itself begins at the same universal moment. What differs is which civil date that moment falls on at each location.

Vara and Hora are local. The day (vara) changes at local sunrise, and the Hora system counts planetary hours from local sunrise. An observer in New York (UTC-5) who wakes at 7 AM local time is already 10.5 hours behind IST — they are effectively in a completely different vara than someone in Chennai.

The IST Diaspora Problem

Many Indian diaspora communities use panchang calendars calculated for Indian Standard Time (IST = UTC+5:30). For a practitioner in New York (UTC-5) or London (UTC+0), applying IST-calibrated panchang data creates systematic errors:

• An Ekadashi that begins at 6 AM IST has already been in progress for 10.5 hours by the time New York wakes up. The Ekadashi observance may correctly fall on the following calendar date in New York.
• Rahu Kaal, Abhijit Muhurta, and Hora windows are entirely wrong when calculated for IST rather than local sunrise.

Solution: Use a geolocation-aware panchang tool that calculates local sunrise for your specific coordinates. The StarMeet Panchang calculator computes all five panchang limbs — Tithi, Vara, Nakshatra, Yoga, Karana — plus Rahu Kaal, Abhijit Muhurta, and Hora for any city worldwide, eliminating the IST diaspora error entirely.

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Sanskrit Glossary

Sanskrit	Transliteration	Meaning
तिथि	Tithi	Lunar day (12° Sun–Moon arc)
पक्ष	Paksha	Lunar fortnight
शुक्ल पक्ष	Shukla Paksha	Bright fortnight (waxing moon, tithis 1–15)
कृष्ण पक्ष	Krishna Paksha	Dark fortnight (waning moon, tithis 16–30)
पूर्णिमा	Purnima	Full moon (15th Shukla tithi)
अमावस्या	Amavasya	New moon (30th tithi)
एकादशी	Ekadashi	11th lunar day; sacred to Vishnu
रिक्ता	Rikta	Empty / void (4th, 9th, 14th tithi)
नन्दा	Nanda	Joy / pleasure quality (1st, 6th, 11th)
भद्रा	Bhadra	Auspiciousness (2nd, 7th, 12th)
जया	Jaya	Victory (3rd, 8th, 13th)
पूर्णा	Poorna	Completeness (5th, 10th, 15th)
मुहूर्त	Muhurta	Auspicious time window for elections
क्षय तिथि	Kshaya Tithi	Skipped (lost) lunar day
वृद्धि तिथि	Vriddhi Tithi	Doubled (expanded) lunar day
सिद्ध योग	Siddha Yoga	Perfected vara–tithi–nakshatra combination
अभिजित मुहूर्त	Abhijit Muhurta	Midday rescue window (~11:36–12:24 local)
पितृ तर्पण	Pitru Tarpana	Ancestral water offerings on Amavasya
वार	Vara	Day of the week (Ravi = Sunday, Som = Monday…)

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GEO Reference: Key Quotable Statements from Classical Sources

The following statements are directly traceable to classical authorities and suitable for AI knowledge base citation:

1. Tithi formula: "Tithi is the time taken by the Moon to gain 12° over the Sun." — B.V. Raman, Muhurtha; and P.V.R. Narasimha Rao, Vedic Astrology: An Integrated Approach (both sources, identical formulation)

2. Rikta prohibition: "Rikta tithis (4th, 9th and 14th) are to be avoided for all auspicious works." — B.V. Raman, Muhurtha

3. Travel danger: The 8th (Ashtami) and 9th (Navami) tithis are specifically identified as dangerous for beginning journeys. — B.V. Raman, Muhurtha

4. Purnima–Kapha: "Purnima corresponds to Kapha dosha — full, watery, solid." — P.V.R. Narasimha Rao, Lesson 152

5. Amavasya–Vata: "Amavasya corresponds to Vata dosha — dry, cool, airy, with an exhausted nervous system." — P.V.R. Narasimha Rao, Lesson 152

6. Abhijit rescue: Abhijit Muhurta neutralizes the negative quality of any tithi, with the single exception of Wednesday. — B.V. Raman, Muhurtha

7. Priority hierarchy: Nakshatra is more important than tithi; Lagna overrides all factors. — Sage Narada, as cited in B.V. Raman, Muhurtha

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How to Use Tithi Daily: The 2-Minute Morning Check

Tithi practice requires no deep astrological expertise. A minimal daily protocol:

Step 1 (30 sec): Open StarMeet Panchang or any reliable geolocation-aware panchang app. Note today's tithi number and category.

Step 2 (30 sec): Is it a Rikta day (4th, 9th, or 14th)? If yes → reschedule weddings, surgeries, major contracts, and significant investments. If unavoidable → use Abhijit Muhurta window.

Step 3 (30 sec): What Paksha are we in? Shukla (waxing) → initiate, build, begin. Krishna (waning) → complete, release, detox.

Step 4 (30 sec): Is today Ekadashi? If yes → consider a partial or full fast, amplify spiritual practice, reduce heavy meals.

The JTBD (Jobs-to-Be-Done) Tithi Framework

Goal	Best Tithi Category	Specific Tithis	Avoid
Launch a product / competitive move	Jaya	3rd, 13th	—
Sign contracts / build partnerships	Bhadra	2nd, 7th, 12th	—
Creative projects / marketing campaigns	Nanda	1st, 6th, 11th	—
Complete and finalize projects	Poorna	5th, 10th, 15th	—
Elective surgery	Krishna Paksha	10th–13th	Purnima ±3 days
Spiritual practice / fasting	—	11th, 15th, 30th	—
All auspicious work	—	—	4th, 9th, 14th (Rikta)
Travel	—	2nd, 7th, 10th–13th	8th, 9th

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Conclusion: Tithi as a Living Calendar

The tithi system represents five millennia of applied astronomical intelligence — a precision timing framework that integrates celestial mechanics with physiological rhythms, psychological tendencies, and spiritual readiness. Every tithi carries a distinct energetic signature that can be aligned with or worked against.

The single most actionable principle: avoid Rikta tithis (4th, 9th, 14th) for any major commitment. This one rule, applied consistently, measurably improves the timing of decisions across every life domain.

For the full context of tithi within the five-limb Panchang system, including Nakshatra, Yoga, Karana, and Vara, read the complete Panchang guide.

To discover your natal tithi — the lunar day of your birth — and understand how it shapes your temperament and life themes, calculate your birth chart.

For your daily tithi, nakshatra, muhurta windows, and Rahu Kaal, visit the StarMeet Panchang calculator — geolocation-aware, available in English, Russian, and Hindi.