What Is Tithi? Complete Guide to the Hindu Lunar Day

What tithi means in simple language

In the Hindu (Vaidik) calendar, a tithi is a lunar day. It is not the same as a civil midnight-to-midnight day on a wall calendar. A tithi is defined by the angular relationship between the Moon and the Sun: roughly every 12 degrees of elongation between them completes one tithi.

Because the Moon’s motion is not uniform, a tithi can be shorter or longer than 24 hours. Sometimes a tithi begins after sunrise and ends before the next sunrise; sometimes it spans more than one sunrise. That is why serious panchang users always check city and date-specific timings rather than assuming “one tithi equals one clock day.”

On Tithi.live, today’s tithi (आज की तिथि) is shown with location context—Bengaluru, Delhi, Mumbai, Hyderabad, Chennai, Kolkata, Pune, Ujjain, and more—so sunrise-linked observance can match your place.

The 30 tithis of a lunar month

A traditional lunar month has 30 tithis, split into two pakshas (fortnights). Shukla Paksha is the bright fortnight from Amavasya toward Purnima, when the Moon’s visible light increases. Krishna Paksha is the dark fortnight from Purnima toward Amavasya, when light decreases.

The named tithis in each paksha are: Pratipada, Dwitiya, Tritiya, Chaturthi, Panchami, Shashthi, Saptami, Ashtami, Navami, Dashami, Ekadashi, Dwadashi, Trayodashi, Chaturdashi, and then Purnima (full moon) or Amavasya (new moon) depending on the paksha.

Many vratas are tied to specific tithis. Ekadashi is famous for fasting; Chaturthi is associated with Ganesha worship in many homes; Ashtami appears in Navratri and Krishna Janmashtami contexts; Amavasya and Purnima carry strong ritual and ancestral observances in different regions.

• Shukla Paksha: waxing Moon, building light, many auspicious household rites.
• Krishna Paksha: waning Moon, different vrat and ancestral customs by tradition.
• Same tithi name can fall on different weekdays each month—always check the current panchang.

Why tithi can change mid-day

People often notice that a morning calendar says one tithi and an evening app says another. That is normal. Tithi boundaries are astronomical moments, not fixed to sunrise. For fasting and puja, traditions differ on whether the governing tithi is the one at sunrise (udaya tithi), the one that spans a certain portion of the day, or a special rule for a festival.

This is one reason “copy-paste panchang” from another city can mislead. Rahu kaal, sunrise, and even effective tithi for a rite can shift with longitude and local sunrise. Tithi.live is designed so you select a city and date, then read tithi with other limbs of the panchang together.

If you are planning a samskara, wedding muhurta, or strict vrat, treat online tools as a clear starting point and confirm with a trusted local pandit when tradition requires precision.

How to use today’s tithi practically

For everyday life, tithi helps answer: Is today a common fasting day? Is it near Purnima or Amavasya? Does a festival fall today in my region? Combined with vara (weekday), nakshatra, and rahu kaal, tithi becomes part of a daily decision framework rather than a single magic number.

A practical routine many households use: open aaj ka panchang in the morning, note tithi and paksha, check whether any vrat applies, note rahu kaal before scheduling travel or contracts, and glance at festival listings for the week.

You can start on Tithi.live’s daily panchang, the aaj ka panchang guide page, and city pages. When you want deeper context, continue with our guides on reading the full panchang and understanding nakshatra.

Common misconceptions about tithi

Misconception one: “Tithi always matches the English date.” It does not. Misconception two: “If two websites disagree, one must be fake.” Differences often come from calculation schools, timezone handling, or whether the page shows sunrise tithi versus current tithi. Misconception three: “Skipping tithi means the day is inauspicious.” Many productive days simply are not major festival tithis; auspiciousness depends on the purpose and the full muhurta stack.

Another confusion is equating tithi with “good or bad luck.” Classical usage is more specific: certain acts are preferred or avoided on certain tithis for ritual reasons, not because a day is globally “bad.”

Learning tithi well builds confidence: you stop depending on vague social posts and start reading a structured almanac. That is the purpose of this guide library on Tithi.live—clear, original education alongside free daily data.

Worked example: keep the transition with the date

Suppose the displayed tithi ends at 10:20 AM and local sunrise is 06:15 AM. The label at sunrise and the label at noon may then differ. These are illustrative times: the key is to record when the tithi changes instead of treating the entire civil date as one unchanging label. For a festival, consult its specific rule before choosing sunrise, midday or an evening interval as the relevant reference.

Sources and further reading

• India Meteorological Department — Rashtriya Panchang

  An independent published calendar reference. Its inclusion does not imply endorsement or that it supplies this site’s daily data.