A Babylonian tablet talks about Comet Halley passing by the Earth
Every 76 or 75 years and observations on the movement of the moon and planets
In 164 BC. Since the tablet talked about the comet
The year 164 BC, and its movement every 76 years, means that the previous monitoring was in 240 BC, and so on.
Halley's Comet (/ˈhæli/ or /ˈheɪli/), officially referred to as 1P / Halley, is a short-period comet, visible from Earth every seventy-five or seventy-six years. Halley is the only short-period comet that is repeatedly visible to the naked eye from Earth. It is also the only comet that can be seen with the naked eye twice in a person's lifetime. Comet Halley last appeared in the inner parts of the solar system in 1986, and will next appear in mid-2061 AD.
The cycle of Halley's Comet has changed between seventy-four and seventy-nine years since its first appearance observed by humans in 240 BC. Comets generally revolve around the Sun in elliptical (ellipse-shaped) orbits that are wide (to the point that centuries may pass before they pass near the Earth). The closest point to the Sun in the comet's path is 0.6 FU from the Sun. This point is located between the paths of Mercury and Venus. The furthest point from the Sun in the path of Halley's Comet is 35 ft. from the Sun. This is approximately equal to the distance at which the planet Pluton is from the Sun. The path of Halley's Comet is retrograde, meaning that the comet is moving in the opposite direction to the motion of the other planets. This issue is rare in the solar system.
The tablet was stolen from Iraq and settled in the British Museum
Source: websites