# Year/Related Articles

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A list of Citizendium articles, and planned articles, about Year.

## Parent topics

• Astronomy [r]: The study of objects and processes in the observable universe, e.g. stars, planets, comets or asteroids. [e]
• Planet [r]: A cosmic body orbiting a star. [e]
• Earth [r]: Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Earth (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
• Calendar [r]: A method used for keeping time on a scale of years. [e]

## Other related topics

• Light day [r]: Distance that light travels in a vacuum in one day; 1 light day = 25,902,068,371,200 m = 2.5902067 * 1013m. [e]
• Light hour [r]: Distance that the light travels in vacuum in one hour, 1.0792528 * 1012m [e]
• Light minute [r]: Distance that light travels in vacuum in one minute; 17,987,547,480 m = 1.7987547 * 1010m. [e]
• Light second [r]: Distance that light travels in vacuum in one second; 2.99792458 * 108m. [e]
• Light week [r]: Distance that light travels in a vacuum in one week; 1 light week = 1.81314469 * 1011km. [e]
• Light year [r]: Distance that light travels in vacuum in one year; 9,460,730,472,580.800 km = 9.4607304 * 1012 km. [e]
• Mathematics [r]: The study of quantities, structures, their relations, and changes thereof. [e]
• Perennial plant [r]: A plant that lives for more than two years. [e]
• Sundial [r]: An instrument for measuring time, using the position of the sun in the sky. [e]