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20170422

What is One Light Year?

One Light year means what?



1e15m comparison cat's eye nebula barnard 68 one light year

Photo Source -By Paul Stansifer, User:84user, ESA, NASA and ESO (and see "source") [GPLv2GFDLCC BY-SA 2.5CC BY 4.0 or Public domain], via Wikimedia Commons


The distance traveled by light in one year is One Light Year.

Distance traveled by light in one second - 
299791 miles ie 3 lac miles per second.

Distance between Earth and Moon - 
385000 kms

Time required for moon light to reach Earth - 
1.3 seconds

Distance between Earth and Sun - 
149,597,890 = 15 crore kms

Time required for sunlight to reach Earth - 
8 minutes


MISMATCH
As per Hindu Purans - Srimad Bhagvat,
Moon is exactly at half the distance of the Sun.

It is said Sun is at 10000 Yojans from Moon and Moon is at 10000 Yojans from Earth.
However Yojan is very short distance hence

One Yojana is 12-15 Kms
So it means 15000 Kms is Moon
And 30000 Kms is Sun
which does not seem so true.
So perhaps the ancient people were not so good at distance calculations.

Reference - https://en.wikipedia.org/wiki/Yojana



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