Earth, being the third planet from the Sun, is the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4.5 billion years ago. Earth also interacts with other objects in space, especially the Sun and the Moon.Earth revolves around the Sun in 365.26 days, a period known as an Earth year and this has continued to be the ages past. During this time, Earth rotates about its axis at about a point estimate of 366.26 times.

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It has been proven that the accretion of Earth started after the formation of the calcium-aluminium-rich inclusions and the meteorites. Owing to the fact that the exact amount of time this accretion process took is not known even presently, and the estimations from various accretion models range from a few million up to about 100 million years, the absolute age of Earth is complex and difficult to figure out. It is also complex and time consuming to determine the absolute age of the oldest rocks on planet Earth, exposed at the surface, and this is due to the fact that they are aggregates of minerals of possibly different ages.

THIS WILL BE OUR GUIDE FOR TODAY'S POST ON GEOLOGY

1 Development of modern geologic concepts
2 Early calculations

Development of modern geologic concepts

In the mid-18th century, there was a naturalist by the name- Mikhail Lomonosov who opined that Earth had been created separately from the rest of the universe several hundred thousand years before the rest of the universe came into form. Lomonosov's ideas were mostly speculative.
In 1779, the Comte du Buffon attempted to obtain a value for the age of Earth thereby making use of an experiment: He went ahead to creat a small globe that has the resemblance of Earth in composition and then measured its rate of cooling. His experiment brought him to a conclusion of an estimate that Earth was about 75,000 years old.

Other scientific naturalists also made use of these hypotheses to build up a history of Earth, though their time estimates were slightly inexact due to the fact that they did not know how long it took to lay down stratigraphic layers.
In 1830, A renowned geologist by the name Charles Lyell, went ahead to develop ideas and experiments found in James Hutton's works, He then popularized the concept that the features of Earth were in perpetual change, eroding and reforming continuously, and the rate of this change was roughly constant
This served as a challenge to the traditional view, which view the history of Earth as being static.
These led a reasonable number of naturalists that were influenced by Lyell to become "uniformitarians" who believed that changes were constant and uniform.

Early Calculations

In 1862, A physicist known as William Thomson, published calculations and estimates that fixed the age of Earth to be between 20 million and 400 million years old. He assumed that Earth had formed as a fully molten object, and also computed the amount of time it would take for the near-surface to cool to its present temperature. His calculations did not account for heat produced as a result of radioactive decay (a process or activity as at then unknown to science) or, more importantly, convection within the Earth, which gives room for more heat to escape from the interior to warm rocks beside the surface.

Kelvin gave his own estimate of the sun, which were based on estimates of its thermal output and a theory that the Sun derives its energy from gravitational collapse; Kelvin also estimated that the Sun is about 20 million years old.

Well known Geologists such as Charles Lyell made known of his non acceptance to such a short age for Earth. For biologists, even 100 million years looks much too short to be accredited.
In Darwin's theory of evolution, I quote,

the process of random heritable variation with cumulative selection requires great durations of time.

Other recognized scientists backed up Thomson's figures.
Charles Darwin's son, the astronomer George H. Darwin, vividly opined that Earth and Moon had broken apart in their early days when they were both molten. He gave estimates on the amount of time it would have taken for tidal friction to give Earth its current 24-hour day. His estimated value of 56 million years added additional proof that Thomson was making sense in his analysis
.
The last estimated value that Thomson gave, in 1897, was that:

it was more than 20 and less than 40 million year old, and probably much nearer 20 than 40.

this research took me 2 days to complete, thanks to @geopolis for igniting the scientific research spirit in us. these are my references:

• Age of the Earth". U.S. Geological Survey. 1997. Archived from the original on 23 December 2005. Retrieved 2006-01-10.

• Dalrymple, G. Brent (2001). "The age of the Earth in the twentieth century: a problem (mostly) solved". Special Publications, Geological Society of London. 190 (1): 205–221. Bibcode:2001GSLSP.190..205D. doi:10.1144/GSL.SP.2001.190.01.14.

• Manhesa, Gérard; Allègre, Claude J.; Dupréa, Bernard & Hamelin, Bruno (1980). "Lead isotope study of basic-ultrabasic layered complexes: Speculations about the age of the earth and primitive mantle characteristics". Earth and Planetary Science Letters. 47 (3): 370–382. Bibcode:1980E&PSL..47..370M. doi:10.1016/0012-821X(80)90024-2.

• Braterman, Paul S. (2013). "How Science Figured Out the Age of Earth". Scientific American. Archived from the original on 2016-04-12.

Thanks for your time and audience,

I remain your brother, gabeman!