On This Day 25 August

By TheBoldAge. Published 2020-08-25
In 325 the Council of Nicaea declared the doctrine of the holy trinity; in 1929 the Hindenburg disaster ended the age of the zeppelins; in 1939 the Wizard of Oz was released; in 1944 Paris was liberated and in 1988 we had the first GCSE results published. In 1609 Galileo presented his first telescope to Venetian lawmakers.

Galilean telescope was demonstrated to Venetian lawmakers in 1609

While Galileo was not the first to use a telescope he was the first to use it to look up into the night skies and observe the celestial bodies overhead. His initial version magnified 8x, although he continued to improve until he got 20x magnification using a refracting telescope.

telescope

With his telescope he was able to observe:

  • the Moon; he calculated the heights of the mountains on the moon
  • Jupiter's moons
  • the phases of the Venus
  • Sunspots
  • Saturn's rings

Other events on this day

  • 325: Council of Nicaea declared the doctrine of the holy trinity
  • 1609: Galileo demonstrated his telescope
  • 1929: Hindenburg disaster ended the age of the zeppelins
  • 1939: The Wizard of Oz was released, starring Judy Garland
  • 1944: Liberation of Paris
  • 1988: first GCSE results published
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