Can you explain the specific date and time of Sai Baba's Mahasamadhi as detailed in Chapter 42?

According to Chapter 42 of the Sai Satcharitra, Sai Baba's Mahasamadhi occurred in the Shaka year 1840, during the first month of the sun's southern transit (Dakshinayan). The day was the festival of Vijayadashami in the bright half of the month (Shukla Paksha). This corresponded to the 9th day of the Muslim month, which was the eve of Moharram, known as the night of 'Kattal'. The chapter states that Sainath made preparations for his departure during the third watch of the day, a time when the people of Shirdi, who had enjoyed his company for over half a century, witnessed this profound event.