Calendars in India

A calendar is a system of organising days for social, religious, commercial, or administrative purposes by naming periods of time (day, week, month, year). In India, three principal astronomical systems govern calendars:

• Solar System — based on Earth's revolution around the Sun
• Lunar System — based on the Moon's phases
• Luni-Solar System — year calculated by solar cycle; months by lunar divisions

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Solar Year

• Duration: 365 days, 5 hours, 48 minutes, 46 seconds
• 12 months named after the 12 zodiac signs (Rashis)
• Maintains closest correspondence between year and seasons
• Solar months: Mesha (Aries), Vrishabham (Taurus), Mithuna (Gemini), Karka (Cancer), Simha (Leo), Kanya (Virgo), Tula (Libra), Vrischika (Scorpio), Dhanus (Sagittarius), Makara (Capricorn), Kumbha (Aquarius), Mina (Pisces)

Lunar Year

• Duration: 354 days (12 lunations of 29.26–29.80 days each)
• Falls 11 days short of solar year annually
• Months end either on Amavasya (new moon) or Purnima (full moon)
• Two methods of month commencement:
  • Amasanta — begins with the bright fortnight (day after new moon)
  • Purnimanta — begins with the dark fortnight (day after full moon)
• Most widely followed system across India

Luni-Solar Year

• Year calculated by solar cycle; months by lunar divisions
• Adjustment achieved through intercalation and suppression of days and months
• Followed in Hindu calendars

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Time conversions:

• 1 divasa = 24 hours = 60 ghatikas
• 1 ghatika = 60 palas = 24 minutes
• 1 pala = 60 vipalas = 24 seconds
• 1 Muhurta = 2 ghatikas = 48 minutes
• 2.5 Muhurtas = 2 hours

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• Intercalary month added to the lunar calendar every 2.5 years
• Purpose: adjust the 11-day annual shortfall of the lunar year vs solar year
• Defined as: the month during which no Sankranti occurs (Sun does not transit any rashi)
• Contrasted with Kshaya Masa: month where two Sankrantis occur — this month is dropped
• Also called Mala Masa

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Panchanga accounts for five (panch) limbs (angas):

1. Tithi — lunar day
2. Vaara — weekday
3. Nakshatra — constellation
4. Yoga — sum of longitudes of Sun and Moon
5. Karana — half of a Tithi

Alternately stated as: year, month, paksha, tithi, ghatika.

Two halves of the Hindu solar year:

• Uttarayana — Makara Sankranti to Karka Sankranti (Paush/Jan to Ashadh/Jun) → God's Day
• Dakshinayana — July to December → God's Night
• One solar year = one day + one night of God

Nakshatras: 28 in total; each rashi has 2–3 nakshatras

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• 4 Yugas = 1 Mahayuga = 4.32 million human years
• 1,000 Mahayugas = 1 day of Brahma = 4.32 billion years
• 100 years of Brahma = 1 Mahakalpa

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1. Vikram Samvat

• Origin: ~56 BC; attributed to King Vikramaditya of Ujjain (victory over Sakas)
• Alternative view: Originally the Malawa Gana era, renamed after Chandragupta Vikramaditya (~400 AD)
• Type: Lunar calendar based on ancient Hindu system
• Zero year: 56 BC
• Ahead of Gregorian: 56.7 years
• New year: first day after new moon in Chaitra (March–April Gregorian)
• In Nepal: begins mid-April (solar new year)
• 354 days, 12 months; months same as Saka
• Adhik Masa added every 3 years and 5 years (cycle)
• Most of India: year starts with Kartika as first month
• Used everywhere in India except Bengal

2. Saka Samvat

• Origin: Initiated by King Shalivahan in 78 AD
• Named after the Saka tribe
• Type: Both solar and lunar (Luni-Solar) — lunar months, solar year
• Zero year: near vernal equinox of 78 AD
• Begins: 22nd March every year (21st March in Gregorian leap years)
• 365 days per year; fixed number of days per month
• Month names same as Vikram Samvat: Chaitra, Vaisakha, Jyeshtha, Ashadha, Shravana, Bhadrapada, Ashwina, Kartika, Margshisha, Pausha, Magha, Phalguna
• National Calendar of India (adopted 1957)

3. Hijri Calendar

• Origin: Arabic; previously called Amulfil
• Renamed Hijri/Hejira after Prophet Mohammed's migration (Hijrat) from Mecca to Madina in 622 AD (52nd year of his life) → zero year
• Type: Purely Lunar — 12 months, 354 days
• Day commences at sunset
• No adjustment of lunar-solar difference → falls 1 year short every 33 years vs Gregorian
• 4 sacred months: 1st (Muharram), 7th (Rajab), 11th (Dhu-al-Qadah), 12th (Dhu-al-Hijjah)
• 12 months in order: Muharram, Safar, Rabi-al-Awwal, Rabi-ath-thani, Jumada-al-ula, Jumada-al-akhirah, Rajab, Shaban, Ramadan (9th — fasting month), Shawwal, Dhu-al-Qadah, Dhu-al-Hijjah

4. Gregorian Calendar

• Based on birth of Jesus Christ
• Type: Solar — 365 days, 5 hours, 48 minutes, 46 seconds
• Starts: 1st January
• Intercalation: 1 extra day every 4 years added to February (leap year)
• Year called a civil year

5. Zoroastrian Calendar

• Era commenced: 632 AD
• Parsis observe two new years:
  • Jamshedi Navroz — equinox on March 21
  • Kadmi new year / Pateti — August 31

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• Saka Calendar is the National Calendar of India
• Adopted in 1957 by the Calendar Reforms Committee (set up by Government of India)
• Came into use: March 22, 1957 (Gregorian) = Chaitra 1, 1879 (Saka Samvat)
• Used in: Official Gazette notifications, All India Radio broadcasts, government communications
• Also used for calculating Hindu religious dates
• Purpose: synchronise 30 different calendars then in use across India

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• Indian Heritage & Identity: The plurality of Indian calendars reflects India's civilisational depth — from astronomical precision of Vedic/Hindu traditions to the Islamic Hijri calendar adopted during Mughal rule.
• Continuity of Traditions: The Panchanga system and Nakshatra-based reckoning have been continuously used for over 2,000 years, forming the backbone of Hindu ritual life.
• Cultural Preservation: The Calendar Reforms Committee (1957) represents a modern state's effort to codify and preserve indigenous astronomical knowledge while creating administrative uniformity.
• Religion–Philosophy–Art Linkage: The Yuga concept (Satya–Treta–Dvapara–Kali) permeates Hindu cosmology, literature (Puranas, Mahabharata), temple iconography, and festivals.
• UNESCO / Modern Relevance: The Nakshatra system and the precision of Indian astronomical traditions (used to predict eclipses, determine auspicious timings) reflect advanced ancient scientific knowledge.
• Interlinks: Calendars ↔ Festivals ↔ Agricultural cycles ↔ Religion ↔ Regional Kingdoms (Vikramaditya, Shalivahan)

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• Adhik Masa vs Kshaya Masa: Adhik Masa = no Sankranti in that month (extra month). Kshaya Masa = two Sankrantis in a month (dropped month). Do NOT confuse.
• Vikram Samvat zero year: 56 BC (NOT 78 AD — that is Saka). Common reversal trap.
• Saka Samvat zero year: 78 AD (NOT 56 BC).
• Hijri calendar start: 622 AD (Prophet's migration), NOT 632 AD (Zoroastrian Calendar).
• Lunar year shortfall: 11 days short of solar year (NOT 10, 12, or 13).
• Intercalary month frequency: Every 2.5 years (NOT every 2, 3, or 5 years independently — Vikram Samvat adds it in a 3-year/5-year cycle).
• Shukla vs Krishna Paksha: Shukla = bright half = starts after NEW moon. Krishna = dark half = starts after FULL moon. This is counterintuitive — memorise carefully.
• Amasanta vs Purnimanta: Amasanta starts with bright fortnight (after new moon); Purnimanta starts with dark fortnight (after full moon).
• National Calendar adoption year: 1957 (NOT 1950 or 1947).
• Muhurta = 48 minutes (2 ghatikas), NOT 45 or 60 minutes.
• Saka Calendar starts 22nd March in normal years, 21st March in Gregorian leap years.
• Hijri Calendar has NO intercalation — unlike Hindu lunar calendars, it does not adjust for solar year, causing it to shift by ~11 days per year vs Gregorian.
• Hijri sacred months: 1st, 7th, 11th, 12th — NOT 1st, 5th, 9th, 12th.
• Ramadan is the 9th month of the Hijri calendar — not the first.
• Panchanga has 5 angas — do not confuse with navagrahas or any other grouping.

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• Solar year = 365 days 5 hrs 48 min 46 sec; Lunar year = 354 days; difference = 11 days
• Adhik Masa (= Mala Masa) added every 2.5 years; defined by absence of Sankranti
• Kshaya Masa = two Sankrantis in one month — dropped
• Tithi = lunar day (avg 23 hrs 37 min); Divasa = solar day
• 1 Muhurta = 48 min; 2.5 Muhurtas = 2 hours
• Panchanga five limbs: Tithi, Vaara, Nakshatra, Yoga, Karana
• 28 Nakshatras; each rashi = 2–3 nakshatras
• Uttarayana (Jan–Jun) = God's Day; Dakshinayana (Jul–Dec) = God's Night
• Kali Yuga started 3102 BC; currently running
• Vikram Samvat: 56 BC, lunar, used except Bengal
• Saka Samvat: 78 AD, luni-solar, 365 days, starts 22nd March, National Calendar since 1957
• Hijri: 622 AD, purely lunar, 354 days, no intercalation, falls 1 yr short every 33 years, day begins at sunset
• Gregorian: solar, 365 days, starts 1st Jan, leap day in February
• Zoroastrian: 632 AD; two new years (21 March & 31 August)
• National Calendar adopted: March 22, 1957 = Chaitra 1, 1879 Saka