julian-calendar | space-encyclopedia

Space Travel

11, Feb, 2012

Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.

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Term	Definition
Julian Calendar	A calendar instituted for use in the Roman Empire by Julius Caesar from 46 BC. There were twelve months in a year and three years of 365 days followed by one of 366 days, giving an average of 365.25 days. Since this is 11 minutes 14 seconds longer than the tropical year, which governs when the seasons occur, the seasons gradually moved in relation to the civil year. Because of this, the Gregorian calendar was introduced from AD 1582.

Term

Definition

Julian Calendar

A calendar instituted for use in the Roman Empire by Julius Caesar from 46 BC. There were twelve months in a year and three years of 365 days followed by one of 366 days, giving an average of 365.25 days. Since this is 11 minutes 14 seconds longer than the tropical year, which governs when the seasons occur, the seasons gradually moved in relation to the civil year. Because of this, the Gregorian calendar was introduced from AD 1582.