Around 1820, Charles Xavier Thomas created the first successful, mass-produced mechanical calculator, the Thomas Arithmometer, that could add, subtract, multiply, and divide.

Around 1820, free reed designs began being created in Europe.

Around 1820 they had settled on the Zambian side at Feira ( now Luangwa ).

Around 1820 an estancia ( station ) was established a few miles north on the banks of the Santa Ana River to accommodate the Mission's sizeable cattle herd.

Around 1820, the two neighbouring villages of St-Arnoult and Crevon were joined with Blainville to become Blainville-Crevon.

Around 1820, the Japanese inventor Kunitomo Ikkansai developed various manufacturing methods for guns, and also created an air gun based on the study of Western knowledge (" rangaku ") acquired from the Dutch in Dejima.

Around 1820 the entire Zugspitzplatt was glaciated, but of this Platt Glacier ( Plattgletscher ) only the Northern and Southern Schneeferner remain.

Around 1820 a new loom was invented in Teufen, allowing embroidery in one go.

Around 1820 Samuel Budgett became a partner and the name became H. H.

Around 1820, William " Killymoon " Steward built one of the first tavern / inns in the area.

Around 1820 Bayre sculpted Hercules with the Erymanthean Boar, depicting Hercules during his third Labor, where he had to capture, live, a wild boar from Mount Erymanthos.

Around 1820 " General Geography " was established by Carl Ritter.

Around 1820, at age 19, Heber set out on his own.

Around 1820 the senior Rowland Hazard renamed the nearby industrial village to Wakefield after the town and family of the same name in England, who were friends of his.

Around 1820, Hicks made the first of his many paintings of The Peaceable Kingdom.

Around 1820 he tried to find a medicine to improve appetite and digestive well-being of the soldiers.

Around 1820, a mestizo rancher named Augustine Machado began grazing his cattle on the Ballona wetlands and claimed a fourteen-thousand acre Mexican land grant that stretched from modern-day Culver City to Pico Boulevard in Santa Monica.

* Around 1010, Thorfinnr Karlsefni led an attempted Viking settlement in North America with 160 settlers, but was later driven off by the natives.

Around 500 BCE, following the Achaemenid conquest of Mesopotamia under Darius I, Old Aramaic was adopted by the conquerors as the " vehicle for written communication between the different regions of the vast empire with its different peoples and languages.

Around 250 BC, Archimedes was commissioned by the king to find a way to check the purity of the gold in a crown, leading to the famous bath-house shouting of " Eureka!

Around 1831, when Anne was eleven, she and Emily broke away from Charlotte and Branwell to create and develop their own fantasy world, Gondal.

Around this time, he founded a group called Survivre ( To Survive ), which was dedicated to antimilitary and ecological issues.

Around 500 BC the Ur-Parthenon was dismantled to make place for a newer and grander building, the " Older Parthenon " ( often called Pro-Parthenon, " early Parthenon ").

Around the same time, on the North slope, in a cave next to the one dedicated to Pan since the classical period, a sanctuary was founded where the archons dedicated to Apollo on taking office.

Around 1250 it was mentioned as Arowa.

Around the same time, his mansion in Wisconsin was destroyed by a nor ' easter.

In 1953, a song called " Rock Around the Clock " was written for Haley.

" Rock Around the Clock " was the first record ever to sell over one million copies in both Britain and Germany and, in 1957, Haley became the first major American rock singer to tour Europe.

* A book on the history of Haley's most famous recording, Rock Around the Clock: The Record That Started the Rock Revolution by Jim Dawson was published in June 2005.

" The song was ' Walk Around Heaven ' and in his last words he said ' I'm going to heaven.

Around the age of eight he was sent to a country school in Alphington near Exeter to recover from a life-threatening fever.

Around the turn of the 4th century, as Memphis was continuing to decline in importance, the Romans established a fortress town along the east bank of the Nile.

Around this time, the green conservative movement was sometimes referred to as the crunchy con movement, a term popularized by National Review magazine and the writings of Rod Dreher.

Around 500 million years afterward, the Moon's mantle was able to be extensively melted due to the decay of radioactive elements.

Around 190 AD under the leadership of the scholar Pantanaeus, the school of Alexandria became an important institution of religious learning, where students were taught by scholars such as Athenagoras, Clement, Didymus, and the native Egyptian Origen, who was considered the father of theology and who was also active in the field of commentary and comparative Biblical studies.

Around the same time, East Bay Ray had tried to pressure the rest of the band to sign to the major record label Polydor Records ; Biafra stated that he was prepared to leave the group if the rest of the band wanted to sign to the label, though East Bay Ray asserts that he recommended against signing with Polydor.

Around the 12th century AD, the Sultanate of Ifat was established in Djibouti and northern Somalia, eastern Ethiopia with its capital at Zeila in northern Somalia.

Around this time, toxicologist David Peakall was measuring DDE levels in the eggs of peregrine falcons and California condors and finding that increased levels corresponded with thinner shells.

Around this time, the county of the City of Dublin was established along with certain liberties adjacent to the city proper.

Around three million years ago, what is now the valley of the Jordan River, Dead Sea, and Wadi Arabah was repeatedly inundated by waters from the Mediterranean Sea.

Around noon Domitian, just one month short of his 45th birthday, was dead.