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Advanced time
Refers to civil time that is advanced, typically by one hour, over Standard Time, which is the local civil time. Also called Summer Time (Europe), Daylight Savings Time (U.S.), or War Time (WWI and WWII, various countries). Typically used to take advantage of morning hours in the summer. In Europe, most countries observe advanced time from March through September. |
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Anno domini
Latin, meaning in the year of (our) Lord. The correct designation for a year in the Western calendar system. The abbreviation is A.D., which precedes the year number. The term was first used by the monk Dionysius Exiguus in the sixth century (A.D.) to distinguish years in a paschal table he extended. |
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Anomalistic
See Year, anomalistic. |
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ANSI
Abbreviation for American National Standards Institute. |
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Ante meridiem
Latin, meaning before midday (noon). Corrupted to ante meridian, it refers to hours after midnight and before noon and is abbreviated a.m.. Opposite of p.m.. |
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Aphelion
The point in an orbit around a body that is most distant from that body. Opposite of perihelion. |
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Apogee
The point in an orbit around the Earth most distant from the earth. Opposite of perigee. |
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