The provided keyword, an interrogative sentence in Hindi, seeks to identify a specific lunar day. The grammatical subject and the main point of inquiry is the term "tithi." In this context, "tithi" is a noun. It refers to a lunar day, or the time it takes for the longitudinal angle between the Moon and the Sun to increase by 12 degrees, which is a fundamental unit of time in the Hindu lunisolar calendar. The rest of the phrase serves to specify the exact date ("11 september 2025") and to pose the question ("kaun si hai" - which is it?), all revolving around the identification of this central noun.
According to the Hindu Panchang, on the Gregorian date of Thursday, 11 September 2025, the prevailing lunar day is Chaturthi Tithi of the Shukla Paksha (the waxing phase of the Moon) in the lunar month of Bhadrapada. A tithi's duration is not fixed at 24 hours and its start and end times are calculated based on the Moon's motion relative to the Sun. For this specific date, the Chaturthi tithi begins at approximately 06:19 AM (Indian Standard Time) and continues throughout the day, ending at 03:44 AM on September 12. Since the sunrise on September 11 occurs during the Chaturthi tithi, it is designated as the primary tithi for that day.
The identification of this specific tithi has significant practical and cultural applications. Bhadrapada Shukla Chaturthi is a highly auspicious day celebrated throughout India and by Hindus worldwide as Ganesh Chaturthi, which marks the beginning of the ten-day festival honoring the deity Ganesha. Therefore, understanding the query's focus on the noun "tithi" is essential not just for a calendrical answer but also for connecting the date to its important religious and festive context. The query is fundamentally a request to place a specific solar calendar date within the framework of the lunisolar calendar and its associated traditions.
