AST101H1 Lecture : chapter 3

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AST101H1 Full Course Notes
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AST101H1 Full Course Notes
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Modern measures of time come from ancient observation of motion in the sky. Length of the day is the time it takes the sun to make one full circuit in the sky. Length of a month comes from the moons cycle of phases. Length of year comes from the seasons. Ancient people could estimate the time from the position and phase of the moon. Positions of the stars can also indicate the tim, as long as u know the date. Egyptians divided the daylight into 12 equal parts. A. m and p. m - latin terms ante meridiem and post meridiem (before the middle of the day and after the middle of the day) The names of the seven days of the week are based on: The seven naked-eye objects that appear to move among the constellations. Daylight summer hours were longer (1/12 of the daylight lasts longer) than the daylight winter hours.

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