Date Of Diwali In 2017

Understanding the Date of Diwali in 2017: A Complete Guide

Diwali, the festival of lights, is one of the most significant and widely celebrated festivals in Hinduism and across several other Indian religions. For millions around the world, the precise date is crucial for planning festivities, family gatherings, and religious ceremonies. The date of Diwali in 2017 was Thursday, October 19. However, simply stating this date does little to explain the rich astronomical, cultural, and calendrical logic that determines why Diwali falls on this specific day each year, and why it shifts annually. This article provides a comprehensive exploration of the factors that calculated the date for 2017, offering a foundational understanding applicable to any year.

Detailed Explanation: Why Diwali’s Date Changes Every Year

The primary reason Diwali’s date varies is that it is not based on the fixed, solar-based Gregorian calendar (the calendar most of the world uses) but on the Hindu lunar calendar. Specifically, Diwali is celebrated on the Amavasya (new moon night) of the Kartika month. This is the darkest night of the lunar cycle in the month following the autumn harvest. Because a lunar month is approximately 29.5 days, and the lunar year is about 11 days shorter than the solar year, the lunar dates "move" through the seasons relative to the Gregorian calendar. Without periodic adjustments, festivals would eventually drift through all four seasons. The Hindu calendar system employs complex intercalation (adding extra months) to maintain seasonal alignment, but the date within the Gregorian October-November window still varies.

Furthermore, there is a notable regional variation in how the month is calculated, which can sometimes lead to Diwali being celebrated on different days in different parts of India. The two main systems are:

1. Amanta (or Krishna Paksha) System: Predominant in South India, Gujarat, and Maharashtra. The month ends with the new moon (Amavasya). Thus, Diwali is the new moon day of Kartika.
2. Purnimanta (or Shukla Paksha) System: Predominant in North India. The month ends with the full moon (Purnima). In this system, Diwali falls on the new moon day of the preceding month, which is Ashwin. However, the festival is still universally associated with the Kartika month because the celebrations, especially the main Lakshmi Puja, occur during the bright fortnight (Shukla Paksha) that follows that new moon.

For the year 2017, both major traditions converged on the same Gregorian date: October 19. This convergence happens when the new moon (Amavasya) occurs very early in the morning (before sunrise) in India. On October 19, 2017, the new moon was at 14:53 UTC (20:23 IST). Since this occurred after sunrise in India, the Amavasya was observed on the same calendar day, October 19, leading to unanimous celebration.

Step-by-Step: How the 2017 Date Was Determined

To understand the calculation, one must follow the lunar cycle for that specific year.

1. Identify the Lunar Month: The relevant month is Kartika in the Amanta system (or Ashwin in the Purnimanta system, with Diwali on its new moon).
2. Locate the New Moon (Amavasya): Astronomically, a new moon is the moment when the Moon and Sun have the same ecliptic longitude, making the Moon invisible. For 2017, the new moon for the Kartika month occurred on October 19.
3. Apply the Hindu Calendar Rule: In the Hindu tradition, a lunar day (tithi) is defined by the longitudinal difference between the Sun and Moon. A tithi begins when this difference is a multiple of 12 degrees. The Amavasya tithi begins when this difference reaches 0 degrees (the new moon) and ends when it reaches 12 degrees. For Diwali to be celebrated on a particular day, the Amavasya tithi must be present during the local daylight period or at least at sunrise.
4. Check the 2017 Data: On October 19, 2017, the Amavasya tithi was in effect from approximately 14:53 UTC (20:23 IST) on October 19 until around 13:12 UTC (18:42 IST) on October 20. Because the tithi began after sunrise in India on the 19th and was still prevailing at sunset (the time for main pujas), October 19 was confirmed as Diwali. Had the new moon occurred just before sunrise on the 20th, the celebration might have been on the 20th in some regions.

Real-World Examples: Diwali in 2017 Across the Globe

The unified date of October 19, 2017, led to synchronized celebrations, but the experience of the day varied by location due to time zones and local customs.

• India: From the snow-capped Himalayas to the southern tip of Kanyakumari, the day began with oil baths, wearing new clothes, and decorating homes with diyas (earthen lamps) and rangoli (colorful floor art). In the evening, families performed Lakshmi Puja collectively, seeking prosperity. Firecrackers lit up the night sky, though many cities had imposed time-bound restrictions due to pollution concerns.
• Nepal: Celebrated as Tihar or Deepawali, the festival

lasts five days, with the third day dedicated to Lakshmi Puja, coinciding with the Indian Diwali. Streets and homes were illuminated with oil lamps, and cows, dogs, and crows were honored on preceding days, reflecting the unique cultural emphasis on animals.

• Sri Lanka: The Tamil Hindu community observed Diwali with traditional fervor, lighting lamps and offering prayers. In Colombo and Jaffna, public celebrations included cultural performances and community feasts, blending local traditions with those from the Indian subcontinent.

• Malaysia and Singapore: Large Hindu populations celebrated with open houses, inviting neighbors of all backgrounds to share in the festivities. Temples held special prayers, and public spaces were adorned with lights and decorations, showcasing the multicultural harmony of these nations.

• United States and United Kingdom: Hindu diaspora communities organized grand celebrations in temples and community centers. In cities like New York, London, and Leicester, public Diwali events featured music, dance, and fireworks, reflecting the festival’s growing global recognition.

• Fiji and Mauritius: These island nations, with significant Indian-origin populations, saw Diwali as a public holiday. Families gathered for prayers, shared sweets, and lit lamps, maintaining a strong connection to their cultural roots despite geographical distance.

The 2017 Diwali was notable not just for its unified date but also for the way it highlighted the festival’s adaptability and universal appeal. Whether in a bustling metropolis or a quiet village, the essence of Diwali—the triumph of light over darkness, knowledge over ignorance—remained unchanged. The shared date fostered a sense of global unity among Hindus and inspired cross-cultural appreciation, as people of all backgrounds joined in the celebrations, lighting lamps and sharing in the joy of the season.