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Sundial






Jesse Russell, Ronald Cohn

Sundial

бумажная книга

     
(0 голосов )
  • ISBN: 978-5-5133-0923-9

Аннотация к книге "Sundial"

High Quality Content by WIKIPEDIA articles! A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style onto a surface marked with lines indicating the hours of the day. The style is the time-telling edge of the gnomon, often a thin rod or a sharp, straight edge. As the sun moves across the sky, the shadow-edge aligns with different hour-lines. All sundials must be aligned with the axis of the...