Science
California State University Northridge Motion of Precession Lab Report

California state university Northridge

Question Description

I’m working on a Environmental Science exercise and need support.

I am putting two different labs in one doc because they relate with eachother and are assigned together.

Thank you !!

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DATE RIGHT ASCENSION DECLINATION 1500 BC 22h 33m 71º 500 BC 23h 00m 76º 500 AD 23h 30m 81º 1500 AD 00h 15m 87º 2000 AD 02h 33m 89º 2500 AD 11h 23m 88º 3500 AD 12h 22m 82º 4500 AD 12h 54m 77º 5500 AD 13h 23m 71º 6500 AD 13h 52m 66º 7500 AD 14h 21m 61º LAB #7 ANSWER SHEET Name _________________________ THE ZODIAC TABLE Traditional (Tropical) Zodiac Constellation January 1st February 1st March 1st April 1st May 1st June 1st July 1st August 1st September 1st October 1st November 1st December 1st YOUR BIRTHDAY! Zodiac Constellation Using IAU Boundaries Laboratory 7-Precession Objective: In this laboratory the motion of precession will be investigated and how it affects the appearance of the night sky over a long period of time, particularly the North Star. Background: Precession refers to a change in direction of the axis of a rotating object. The most familiar example of Precession can be observed in spinning tops. As a top begins to slow down it axis begins to rotate in a circle. The same phenomenon is observed for the Earth, but in the case of the Earth it takes 26,000 years for a complete revolution. Earth is not completely spherical; it has a slight bulge at the Equator. Gravitation forces of the Sun and Moon on this bulge produce the Precession. Currently the Earth’s northern axis points almost exactly to the star, Polaris which is more commonly referred to as the North Star. However, because of precession the position of stars will change slowly but continuously over a period of 26,000 years. In approximately 13,000 years Earth’s northern axis will point to the star Vega, at which time it will be referred to as our North Star. Because of precession, the position of the stars in the sky change slowly but continuously as viewed from Earth. Since a circle is divided into 360°, each year corresponds to a change in the sky of 0.0138°, or 49.8" per year, or 1° 23’ per century, or 13° 1’ 23" per millennia. This is quite a significant change. For example the full moon only takes up an angle of 0.5° in the sky. Therefore all of the celestial objects have moved approximately 26 times the diameter of the full moon every thousand years. With the Starry Night software it is possible to simulate what the sky looks like at any given time between 4173 B.C.E. (BC) and 10000 C.E. (AD). It is this flexibility in time that we will utilize today, and verify the precession of Earth’s axis. Astrology is a set of traditions or beliefs in which the knowledge of apparent positions of celestial objects is considered useful in understanding human affairs. If you place faith in Astrology you believe your life is determined by the position of the Sun and Planets at the time of your birth. That is, your astrological sign (zodiac sign) is determined by what constellation the Sun was in on the day of your birth. Nearly all the early civilizations had some form of Astrology. Statistical experiments have found no correlation with time of birth and different characteristics, including occupation, anxiety levels, marital status, aggressiveness, sociability, IQ levels and ability in art, sports, mathematics. The Ecliptic As the Earth orbits the Sun the position of the Sun against the background stars changes. If the Sun could be turned off you would be able to see the position of the Sun shift throughout the year. During a year the Sun moves on the celestial sphere along a path called the ecliptic. The ancients believed that the constellations though which the Sun moved had special powers and dubbed these the constellations of the Zodiac. Traditionally, there were twelve constellations of the zodiac and each one was granted the same period of time. However, if we look at the actual path of the sun through the stars we find that there are actually 13 constellations through which the sun moves. Furthermore, the sun’s spends more time within some constellations than others. 2 EXERCISE #6-1: “What’s your sign?” Ancient astrologers divided the ecliptic into twelve equally spaced zodiac signs. These signs were then said to govern the lives of those born during the month at which the Sun was said to be in that constellation. These dates did not take into account the different lengths of the ecliptic path that actually fell within that constellation. Also, because of the precession of the earth over the 3000 or so years the system was used. So what sign were you REALLY born under? In what constellation was the Sun on the day of your birth? Let’s compare the two. Go to the Wikipedia website: https://en.wikipedia.org/wiki/Zodiac Scroll down to the bottom of the website to the “Table of Dates.” This table shows the dates for which the Traditional (Tropical) Zodiac correspond and are what has been taught in western astrology as your “sign”. On the right side of the table are the dates when the Sun is within that constellations boundaries as determined by the International Astronomical Union. The Zodiac Table has a list of dates down the left hand side. Determine which Traditional constellation somebody born on that day would have as well as the actual constellation in which the Sun was located according to the IAU boundaries. At the bottom include your birthday! Once you are finished Sign the table and upload it to Canvas. 3 EXERCISE #6-2 “Precession and Polaris” Now let’s examine the effect of precession on our view of the Stars. Today we consider the star Polaris to be the “North Star” because of its location near the North Celestial Pole. However, Polaris wasn’t always the North Star and won’t be in the future. Let’s see how the Earth’s precession moved Polaris in the Celestial Sphere. Download the data of the Right Ascension and Declination of Polaris over the years. Plot and label each point of data on the blank Polar Star chart (review the second half of the Polar Plotting Video for help). Trace a smooth curve between the dots using your favorite colored pen or marker. Notice the simple geometric shape that this path appears to make. Sign and date the plot and upload it to Canvas. 4 ...
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Final Answer

Hello buddy, find the attached.


LAB #7

ANSWER SHEET

Name _________________________

THE ZODIAC TABLE
Traditional (Tropical) Zodiac
Constellation
January 1st
February 1st
March 1st
April 1st
May 1st
June 1st
July 1st
...

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