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Most other languages lack formal abbreviations for "before noon" and "after noon", and their users use the 12-hour clock only orally and informally. [citation needed] However, in many languages, such as Russian and Hebrew, informal designations are used, such as "9 in the morning" or "3 in the night".
Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian.
Dawn begins with the first sight of lightness in the morning, and continues until the Sun breaks the horizon. The morning twilight is divided in three phases, which are determined by the angular distance of the centre of the Sun (degrees below the horizon) in the morning. These are astronomical, nautical and civil twilight.
Morning is the period from sunrise to noon. It is preceded by the twilight period of dawn. There are no exact times for when morning begins (also true of evening and night) because it can vary according to one's lifestyle, latitude, and the hours of daylight at each time of year. [1] However, morning strictly ends at noon, when afternoon starts.
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
Afternoon occurs between noon and sunset, [29] or between noon and the start of evening. This period of time sees human's highest body temperature, [30] an increase of traffic collisions, [31] and a decrease of productivity. [32] Evening begins around 5 or 6 pm, or when the sun sets, and ends when one goes to bed. [33] [34] [35]
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