Year/Related Articles

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]

Month [r]: Unit of time originally corresponding approximately to one cycle of the moon's phases, or about 30 days or 4 weeks. ^[e]
Week [r]: Time unit equal to a number of days, now usually seven calendar days, previously weeks of between 4 and 20 days have been used historically in various places. ^[e]
Day [r]: Defined as 86,400 seconds, using the SI definition of second. ^[e]
Equinox [r]: Add brief definition or description
Aphelion [r]: Add brief definition or description
Perihelion [r]: Add brief definition or description
Leap year [r]: Add brief definition or description

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]