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  1. blog.uvahealth.com › 2015/03/12 › history-cancerThe History of Cancer: A Timeline - Healthy Balance

    Mar 12, 2015 · 1970s. President Nixon signed the National Cancer Act and funds were poured into the trials of new chemicals for cancer treatment. The NCI designated 20 Comprehensive Cancer Centers, hospitals with dedicated cancer centers. Radioactive seeds for internal radiation were used for prostate cancer and other cancers (Brachytherapy).

  2. www.wikiwand.com › en › 14001400 - Wikiwand

    Dec 25, 2019 · The year 1400 was not a leap year in the Proleptic Gregorian calendar. Year 1400 (MCD) was a leap year starting on Thursday of the Julian calendar. Introduction 1400

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  4. time.com › 4237292Leap Year History: How Leap Day Came to Be | TIME

    The phrase “leap year,” which probably refers to the jump in days of the week—a calendar date usually moves forward one day of the week per year, but it moves two days in a leap year ...

  5. news.wsu.edu › news › 2020/02/19WSU experts explain the origins of the Leap Year

    Feb 19, 2020 · To realign the calendar to the solar year, Pope Gregory declared Oct. 4, 1582 the last day of the Julian calendar. The next day would be the debut of the Gregorian calendar, on Oct. 15, skipping ten calendar days and righting the discrepancy. An algorithm was devised to determine whether a leap year is skipped:

  6. www.thoughtco.com › history-of-leap-year-1989846The History of Leap Year - ThoughtCo

    Jan 2, 2021 · A leap year is a year with 366 days, instead of the usual 365. Leap years are necessary because the actual length of a year is nearly 365.25 days, not 365 days as commonly stated. Leap years occur every four years, and years that are evenly divisible by four (2020, for example) have 366 days. This extra day is added to the calendar on February 29.

    • Mary Bellis

  7. historychronicle.com › history-of-the-leap-yearHistory of the Leap Year: Why it Exists and Where it ...

    Feb 27, 2024 · In order to correct the issues, Pope Gregory XIII created the Gregorian calendar that accounted for the deviation by skipping some leap years. For example, every fourth year is a leap year unless it is divisible by 100, like 1800, 1900, and 2000. In that case, it also has to be divisible by 400 to be a leap year.

  8. www.bbc.com › future › articleWhy Julius Caesar's Year of Confusion was the longest ... - BBC

    Feb 28, 2024 · Caesar's answer gave us the longest year in history, added months to the calendar, took them away, anchored the calendar to the seasons, and brought us the leap year. It was a grand project ...

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