The light year was invented, because, at 182,000 miles/second (9,467,077,790 miles a year), it is the fastest thing in the universe. As the universe is very huge, this is more convenient than saying how many singular miles things are from each other. Ex: 2 light years instead of 18,934,155,580 miles.
In spite of its name, a light year does not indicate time, but it indicates distance! It actually equates to the distance that light travels in one Earth year, which is a very big distance, seeing that light travels at 186,000 miles per second.
17987547480m/min -> speed of light per minute 299792458m/s -> speed of light per sec or light speed
What is considered to be the first "true" microscope was invented in Holland in about 1595.
The summer is defined by the 3 months of the year that the angle of the light of the sun is most direct on your area. Winter is when the light is least direct on you. Spring is when light is continually becoming more and more direct, and fall is when light is getting less and less direct.
Summer. The first day of summer is the longest day of the year. The first day of winter is the shortest day of the year.
The flourescent light bulb was invented in 1827.
Joseph Swan invented light bulb in 1879
Well, because we need to know the light year
1868
2014
He invented the electric light in 1880
1879
october 22, 1879
The light bulb was invented by Thomas Alva Edison in 1879.
The light bulb was created in 1882 by Thomas Edison.
The year that New York got its first electric light system was in 1896.
The first traffic light was invented in 1903 by William L. Potts.