It's about one-and-one-tenth times as long as The First artificial heart patient's survival.
In other words, 4 months is 1.09 times the length of The First artificial heart patient's survival, and the length of The First artificial heart patient's survival is 0.917 times that amount.(1982) (Dr. Barney Bailey Clark; first permanent, pneumatic device)
On December 2nd, 1982 Dr. William DeVries implanted the first artificial heart into Dr. Barney Bailey Clark, who went on to live for 3.68 months. This early model of the artificial heart was controlled and powered by an external, 146.51 kg (323 lb) machine that Dr. Clark had to cart with him as he moved throughout the hospital.
It's about one-and-one-tenth times as long as The Spanish-American War.
In other words, 4 months is 1.12 times the length of The Spanish-American War, and the length of The Spanish-American War is 0.893 times that amount.(1898)
The War between Spain and the United States over the liberation of Cuba began on April 25th, 1898 and lasted until the signing of the Treaty of Paris on August 12th, 1898, 3.55 months. The Treaty gave the United States control of Cuba, the Philippines, Puerto Rico, and Guam.
It's about one-and-three-tenths times as long as The First spaceflight (Sputnik).
In other words, the length of The First spaceflight (Sputnik) is 0.77 times 4 months.(a.k.a. Sputnik 1, a.k.a. Спутник-1, a.k.a. "Satellite-1", a.k.a. Простейший Спутник-1) (1957) (total time in orbit)
Launched from Kazakhstan in 1957, Sputnik was the first artificial satellite placed into orbit around Earth, where it remained for 3 months. During its voyage, it traveled about 70,000,000 km (43,495,983.46 mi), completing an orbit of the planet every 0.0022 months.
It's about one-and-four-fifths times as long as The Voyage of the Mayflower.
In other words, the length of The Voyage of the Mayflower is 0.56 times 4 months.(1620)
Having left Southampton, England on September 16th (new style), 1620, the Mayflower dropped anchor near Cape Cod, Massachusetts 2.2 months later on November 21st (new style), 1620. The voyagers had planned to travel in a convoy of two ships, but the smaller Speedwell was found to be leaking (evidently as a result of sabotage) and all passengers had to be moved to the Mayflower instead.
It's about two times as long as Columbus' voyage to America.
In other words, the length of Columbus' voyage to America is 0.5 times 4 months.(1492) (first voyage)
Attempting to find a western route to Asia, Christopher Columbus set sail on August 3rd, 1492 and landed in the Bahamas on October 12th — 2 months later. After one of Columbus' ships, the Santa Maria ran aground in present-day Haiti, he ordered that the timber be used to used to build a fort and settlement called La Navidad; it remains missing to archaeologists to this day.
It's about two-and-a-half times as long as The First US Continental Congress.
In other words, the length of The First US Continental Congress is 0.42 times 4 months.(1774) (Philadelphia, Pennsylvania)
The First Continental Congress — which included such notable members as Samuel Adams, Thomas Paine, Patrick Henry, John Jay and George Washington — met from September 5th to October 26th, 1774 — a total of 1.7 months. Of the thirteen original American colonies in existence at the time, only the Province of Georgia sent no delegates to the Congress.
It's about four times as long as a William Henry Harrison's Presidency.
In other words, 4 months is 3.86 times the length of a William Henry Harrison's Presidency, and the length of a William Henry Harrison's Presidency is 0.2591 times that amount.(a.k.a. William Henry Harrison, a.k.a. "Tippecanoe," a.k.a. "Old Tippecanoe") (1841)
Having caught pneumonia and pleurisy early in his term as President of the United States, William Henry Harrison died after 1.036 months minutes in office. Following his death, Congress approved a Presidential widow's pension for Harrison's wife, Anna Symmes, who received a year's worth of Harrison's presidential salary — $25,000 — and the right to free postage for the remainder of her life.