Julian year astronomy The Julian year, as used in astronomy and other sciences, is a time unit defined as exactly This is the normal meaning of the unit “year” symbol “a” from the Latin annus used in various scientific contexts. Fundamentally, expressing a time interval in Julian years is a way to precisely specify how many days not how many “real” years , for long time intervals where stating the number of days would be unwieldy and unintuitive. By convention, the Julian year is used in the computation of the distance covered by a light-year. Sidereal, tropical, and anomalistic years[ edit ] The relations among these are considered more fully in Axial precession astronomy. Each of these three years can be loosely called an astronomical year. The sidereal year is the time taken for the Earth to complete one revolution of its orbit , as measured against a fixed frame of reference such as the fixed stars, Latin sidera, singular sidus. The modern definition of mean tropical year differs from the actual time between passages of, e. Because of the Earth’s axial precession , this year is about 20 minutes shorter than the sidereal year. The mean tropical year is approximately days, 5 hours, 48 minutes, 45 seconds, using the modern definition.

18 Things Every 18 Year Old Should Know

How to be 18 again ———————— When you turn 18 you are a free man. You can kick off the shackles and go about your life as you wish. But the plan that is likely laid out for you is a plan destined to fail, so you’ve got to make the right choices to get a jumpstart on a life of health, wealth and happiness. Regrets are pointless, but if for some reason I was put into a time machine and found myself 18 years old again this is what I’d be glad to know.

Assuming you are a westerner, especially an American, getting married young will be the biggest mistake of your life.

Vague year[ edit ] The vague year, from annus vagus or wandering year, is an integral approximation to the year equaling days, which wanders in relation to more exact years.

This is terrible and a child abuse. August 6, at 5: I have a daughter who is August 6, at 2: I don’t even know what that means but it sure sounds like you are just fine with child rape. August 6, at 6: These pathetic “men” who need to marry these little babies speaks volumes of just how masculine they are NOT! They must not be able to have a healthy relationship with someone their own age since they marry these little babies.

August 6, at She has dreams and this so called man will crush all of them. The days of a male dominated society is dwendling down. August 7, at 1:

18 Things Every 18 Year Old Should Know

January 9, at

Old and young (18+)

It has more to do with customs and culture than anything else.

18 year old

April 22, at

18 Things Every 18 Year Old Should Know

What about all the other 3rd world countries that dont have access to the outside media?

18 year old

Women in our feminized classrooms are consigning generations of our sons to years of misery and diminished futures.

Old and young (18+)

This is currently on or close to January 1.