Start of Kali Yuga

At the start of “Kali Yuga,” all planets are said to be perfectly aligned.
Its not an observable historical event — but a mathematical zero-point calculated and used in Indian mythology.
The astrologer Āryabhaṭa of the 5th century AD, was the first to calculate it to Midnight, 17/18 February 3102 BCE and defined it as a cosmic starting date for the current Kali Yuga epoch.
At this moment, he stated that:
All seven classical planets (Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn)
were at 0° in Aries.