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The laser works by the same principle as the maser, but produces higher-frequency coherent radiation at visible wavelengths. The maser was the precursor to the laser, inspiring theoretical work by Townes and Arthur Leonard Schawlow that led to the invention of the laser in 1960 by Theodore Maiman. When the coherent optical oscillator was first ...
This is a timeline of Russian history, comprising important legal and territorial changes and political events in Russia and its predecessor states.
The Millennium of Russia monument in Veliky Novgorod (unveiled on 8 September 1862). The history of Russia begins with the histories of the East Slavs. [1] [2] The traditional start date of specifically Russian history is the establishment of the Rus' state in the north in the year 862, ruled by Varangians.
The formal end to Tatar rule over Russia was the defeat of the Tatars at the Great Stand on the Ugra River in 1480. Ivan III (r. 1462–1505) and Vasili III (r. 1505–1533) had consolidated the centralized Russian state following the annexations of the Novgorod Republic in 1478, Tver in 1485, the Pskov Republic in 1510, Volokolamsk in 1513, Ryazan in 1521, and Novgorod-Seversk in 1522.
The Tsar of all Russia, formally the Sovereign, Tsar and Grand Prince of all Russia, [a] [1] was the title of the Russian monarch from 1547 to 1721. During this period, the state was a tsardom . The first Russian monarch to be crowned as tsar was Ivan IV , who had held the title of sovereign and grand prince . [ 2 ]
In Northern Europe and at the court of the Holy Roman Empire, however, the country was known under its own name, Russia or Rossia. [42] Sigismund von Herberstein, ambassador of the Holy Roman Emperor in Russia, used both Russia and Moscovia in his work on the Russian tsardom and noted: "The majority believes that Russia is a changed name of ...
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The Imperial Russian apothecaries' weight was defined by setting the grain (Russian: гран) to be exactly seven-fifths of a dolya. The only unit name shared between the two was the funt (pound), but the one in the apothecaries' system is exactly seven-eighths of the ordinary funt.