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In 1600 Giordano Bruno was burnt at the stake, in part for his teachings of the Copernican, rather than the Ptolemaic, view of the structure of the heavens. It was left to Galileo (between 1609 and 1611) to provide practical proof for the heliocentric model. With the newly invented telescope he discovered mountains 26 The Earth and Time and craters on the Moon and sunspots, which shook the view that the heavens were perfect and unchanging. He also discovered that the milky band of radiance that crossed the starry sky - the Milky Way - was composed of innumerable faint stars.

It was an awesome experience and yet it is rare to see the aurora at all from a latitude of 51 0 N! 10 The Need for Time Measurement The division and measurement of time is tremendously important to mankind. However, most people are ignorant of the fact that time measurement and the classification of its units are based upon astronomical events. Indeed, the chief work of the early astronomical observatories was to mark and measure the passage of time. Their dedication to the purpose of studying the physical natures of the heavenly bodies is relatively recent!

You will notice that iriu has a negative declination. or. in other word. irius lies to the south of the cele tial equator. This fact makes no difference to the calculation. Maximum altitude = (90° - 48 0 50') + (- 16° 41') = 24° 29'. In order to calculate the maximum altitude of a star as seen from the southern hemisphere the same equation is used but with the signs reversed. In other words. the latitude is added to 90° (but remember that the latitude is now a negative number) and the star's declination is now subtracted from the result.

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