Lec02 - Two quick survey questions 1 How many here know...

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Two quick survey questions? 1. How many here know what causes the phases of the moon ?? 2. How many here know their own sign of the zodiac ??
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Where does your “Sun” or “Zodiacal” Sign come from? To see this, let’s review the sun’s apparent path through the sky...
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Path of the Sun through the Zodiac
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Aries - March 21-April 20 Taurus - April 21-May 21 Gemini - May 22-June 21 Cancer - June 22-July 22 Leo - July 23-August 21 Virgo - Aug. 22-Sept. 23 Libra - Sept. 24-Oct. 23 Scorpio - Oct. 24-Nov. 22 Sagittarius - Nov. 23-Dec. 22 Capricorn - Dec. 23-Jan. 20 Aquarius - Jan. 21-Feb. 19 Pisces - Feb. 20-Mar. 20
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1. Our Place in the Universe
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Me and my Dad, ca. 1959...
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Our Place in the Universe Key theme: Scale How to comprehend the enourmous scales in distance, time, speed Especially the huge range of scales Requires some key math concepts “Order of magnitude” or “powers of ten” involves fixed factor vs. fixed sum geometric vs. arithmetic growth
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What do we mean by scale... scale related to “order of magnitude” can refer to time, distance, or even speed.
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