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The Twilight Zone - Defined
Kirt's Cogitations #62

RF Cafe University"Factoids," "Kirt's Cogitations," and "Tech Topics Smorgasbord" are all manifestations of my ranting on various subjects relevant (usually) to the overall RF Cafe theme. All may be accessed on these pages:

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The Twilight Zone - Defined

Twilight is classified as Astronomical when the sun is between 18° and 12° below the horizon, Nautical when between 12° and 6° below the horizon and Civil when between 6° and 0° below the horizon.

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