Time zones


  • Scottish-born Canadian Sir Sandford Fleming proposed a worldwide system of time zones in 1879. 
  • initial effort that led to the adoption of the present time meridians
  • 1876, proposal was for a global 24-hour clock, conceptually located at the center of the Earth and not linked to any surface meridian
  • 1879 he specified that his universal day would begin at the anti-meridian of Greenwich
  • By about 1900, almost all time on Earth was in the form of standard time zones,

MAIN POINTS
  • Earth as a sphere is divided into 360º of longitude.
    • –Divide 360º by 24 time zones (one for each hour of day) equals 15º.
  • Each 15º band of longitude is assigned to a standard time zone.
  • Greenwich Mean Time (GMT) is…
    • –Located at the prime meridian (0º longitude).
  • Passes through Royal Observatory at Greenwich, England
    • –Master reference time for all points on Earth.

Comments

Post a Comment

Popular posts from this blog

ALL ROME NOTES

Etruscans came from north-central part of the peninsula metalworkers, artists, architects two foundation myths: Virgil’s Aeneid (where Aeneas escapes from Troy - sound familiar?) the story of Remus and Romulus Greeks they had many colonies around the Mediterranean Sea Romans borrowed ideas from them, such as: religious beliefs alphabet much of their art military techniques and weaponry the Latins! descendants of Indo-Europeans settled on the banks of the Tiber situated so trading ships - but not war fleets - could navigate as far as Rome, but no further a commercial port, but not susceptible to attack and... built on seven hills (esp. Palatine) many streams flowed into the Tiber there was a marshy area called the Forum,  between Palatine and Capitoline Hills Tarquin the Proud’s grandfather built the Cloaca Maxima (largest ancient drain), which channeled water into the Tiber urban legend says Washington DC was built o
Read more

The Rise of Christianity

roman power spread to Judea Rome took control of the Jewish Kingdom in A.D. 6 two decades after Rome took control the messiah (Jesus) came somewhere in 6 to 4 A.D a jew named Jesus was born in Bethlehem in Judea raised in Nazareth, Northern Palestine Age 30 he began his pubic ministry has 12 men as Apostles (followers) Gospels were written Jesus attracted large crowds Jesus' popularity concerned Jewish and Roman authorities Chief Priests of the Jews denied Jesus was the Messiah  Jesus was accused, by Roman Governor Pontius Pilate, of defying roman authority and was arrested, then crucified After his death, his body was put in a tomb and he resurrected from it  Christos- Greek- "Messiah" or "Savior" Jesus' teachings did not contradict Jewish laws His first followers were Jews Followers began to create a religion based on his teachings Christianity spread slow and steadily throughout the Roman Empire Disagreements about beliefs spread throu
Read more

test day

today we took the test and it went amazing! It was open blog which wa ssoooooooooooooooooooooo clutch!  I studied rlly hard since I'm failing but I still spent like an hour putting all the notes from the powerpoint into my blog because I had a feeling it was gonna be open blog. You should rlly make more tests open blog... please.
Read more