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  2. Nebular hypothesis - Wikipedia

    en.wikipedia.org/wiki/Nebular_hypothesis

    As a result, astronomers largely abandoned this theory of planet formation at the beginning of the 20th century. According to some, a major critique came during the 19th century from James Clerk Maxwell (1831–1879), who in some sources is claimed to have maintained that different rotation between the inner and outer parts of a ring could not ...

  3. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    The categorisation of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).

  4. Dates of classical music eras - Wikipedia

    en.wikipedia.org/wiki/Dates_of_classical_music_eras

    Date ranges of classical music eras are therefore somewhat arbitrary, and are only intended as approximate guides. Scholars of music history do not agree on the start and end dates, and in many cases disagree whether particular years should be chosen at all. The 20th century has exact dates, but is strictly a calendar based unit of time.

  5. Timeline of cosmological theories - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_cosmological...

    Also during this time period, the Greeks established that the Earth is spherical rather than flat. [5] [6] 6th century BCE – Anaximander conceives a mechanical, non-mythological model of the world: the Earth floats very still in the centre of the infinite, not supported by anything. [7]

  6. History of music - Wikipedia

    en.wikipedia.org/wiki/History_of_music

    20th-century music brought new freedom and wide experimentation with new musical styles and forms that challenged the accepted rules of music of earlier periods. [ citation needed ] The invention of musical amplification and electronic instruments , especially the synthesizer, in the mid-20th century revolutionized classical and popular music ...

  7. Outline of classical music - Wikipedia

    en.wikipedia.org/wiki/Outline_of_classical_music

    Musical era (or period) – distinct time frame in the history of music characterized by specific styles, practices, and conventions. Each period reflects the cultural, social, and political contexts of its time. The following is an overview of the stylistic movements within each period.

  8. 20th-century classical music - Wikipedia

    en.wikipedia.org/wiki/20th-century_classical_music

    Modernism, impressionism, and post-romanticism can all be traced to the decades before the turn of the 20th century, but can be included because they evolved beyond the musical boundaries of the 19th-century styles that were part of the earlier common practice period.

  9. Musical historicism - Wikipedia

    en.wikipedia.org/wiki/Musical_historicism

    Musical historicism signifies the use in classical music of historical materials, structures, styles, techniques, media, conceptual content, etc., whether by a single composer or those associated with a particular school, movement, or period.