astronomical twilight

astronomical twilight
either of two periods of partial darkness, after sunset or before sunrise, when the center of the sun is more than 6° but less than 18° below the horizon.

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Universalium. 2010.

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  • York Minster astronomical clock — The York Minster astronomical clock was installed in the North Transept of York Minster in 1955. It was first conceived in 1944 and designed by R d E Atkinson, chief assistant at the Royal Greenwich Observatory. The clock is a memorial to the… …   Wikipedia

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