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Wed, Mar 07, 2007

ANN's Daily Aero-Term (03.07.07): Civil Twilight

Aero-Terms!

Aero-Terms are designed to be a daily reminder of the terms, names, acronyms and explanations of the unique language that populates the aviation world. Aerospace, sport aviation, fixed wing, helo, you name it... it's all fair game.

Aero-Terms should serve as a quick but intriguing reminder of the terms you may use every day, or an introduction to an aspects of the Aero-World you may not yet be familiar with. ANN also encourages readers to go beyond the FMI link, and further research any intriguing terms.

Suggestions for future Aero-Terms are ALWAYS welcome, as are additions or discussion of the explanations given for each Aero-Term.

Civil Twilight

Did you ever want to know the "exact" definition of civil twilight? Get out your compasses (the old-fashioned, pointy kind you used in elementary school), because civil twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically six degrees below the horizon. But wait! There's more! Check out the website... and really amaze your friends with what you will learn.

FMI: http://aa.usno.navy.mil/faq/docs/RST_defs.html#top

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