THE LIGHT SIDE OF TRIGONOMETRY
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1 MATHEMATICAL METHODS: UNIT 2 APPLICATION TASK THE LIGHT SIDE OF TRIGONOMETRY The earth s movement around the sun is an example of periodic motion. The earth s tilt on its axis and corresponding movement around the sun causes the changing seasons and the corresponding changes in the number of daylight hours. The number of daylight hours is also dependent on the position on the earth s spherical surface. The number of daylight hours on any given day of the year can be modeled by a trigonometric function. The following diagrams are taken from satellite images: Figure 2 is an image from the moon kilometres above the earth S E at 23:35 UTC on September 12 th Figure 1 is a sequence of photographs taken from a number of satellites. The photographs in figures 1 and 2 were taken at the same time. The internet site where these photographs were obtained is Select the Astronomy and Space link under the Science heading and then click on the Earth and Moon viewer link. Select either the map of the earth option or the view from moon option. Figure 1 Figure 2 Michael Swanborough 1 Flinders Community Christian College, Victoria
2 OBJECTIVES 1. To develop a model for: a) the time of sunrise in Melbourne for any day of the year. b) the time of sunset in Melbourne for any day of the year. c) the number of daylight hours in Melbourne for any day of the year. 2. To investigate how the position on the earth s surface affects the equation. EQUIPMENT REQUIRED 1. Sun Cycle software. The software can be downloaded from the site: Select the Home and Education category and the Science field. Perform a search for Sunrise in order to locate the software quickly. 2. TI-InterActive! software. COLLECTING DATA The data to be collected is a combination of sunrise and sunset times. The total number of daylight hours can be determined from this data. Naturally, winter represents the least number of daylight hours and summer represents the greatest number of daylight hours. Data can be collected at regular intervals or on a specific day each month (such as the first day). The tables below indicate the suggested dates for the standard year or the leap year. Standard Month Jan Mar Mar Apr May June July Aug Sept Oct Nov Dec Day Cumulative Sunrise Sunset Leap Year Month Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec Day Cumulative Sunrise Sunset Michael Swanborough 2 Flinders Community Christian College, Victoria
3 Michael Swanborough 3 Flinders Community Christian College, Victoria
4 COLLECTING DATA 1. Open the Sun Cycle program. The calendar, as indicated below, should appear. 2. Right click on the calendar, or click on Set-up, to access the specialized controls. 3. As we are interested in the sunrise and sunset times for Melbourne we need to enter the longitude, latitude and time zone for Melbourne. Change each of the following: a) Language: to English (Eng) b) Latitude: to 37 s 49 c) Longitude: to 144 e 58 d) Time Zone: to Uncheck the Season Offset box. 5. Click OK to return to the calendar. 6. Use the Up and Down arrows top select the appropriate Month and click on the Day required. 7. Record the data for Sunrise and Sunset in the table provided. Michael Swanborough 4 Flinders Community Christian College, Victoria
5 PART 1 DETERMINING A MODEL FOR THE TIME OF MELBOURNE S SUNRISE 1. Once the data has been collected it can be transferred to a spreadsheet in TI-InterActive! 2. To speed up the data entry process, open the template file The Light Side of Trigonometry - Template. Otherwise, from the TI-InterActive! toolbar, click on the Spreadsheet icon. a) Label the columns as Hours, Minutes and Total as indicated in the diagram below. b) Enter an appropriate formula to calculate the values in the Total column. c) Repeat for the Sunset data. d) Enter an appropriate formula to calculate the difference between the time of sunset and the time of sunrise. Michael Swanborough 5 Flinders Community Christian College, Victoria
6 3. Prepare a Statistical Plot for the Sunrise data using the cells a3:a14 and d3:d Calculate a sinusoidal regression to determine a model for the total number of minutes between midnight and sunrise. Note: the sinusoidal regression model given by TI-InterActive! is of the form y = asin( bx + c) + d. 5. Copy this function into the o editor. Graph this function on the same set of axes as the statistical plot of the data. 7. Use a Math Box to determine the amplitude, period, horizontal and vertical translations of the function.. Note: TI-InterActive! uses the notation, a _, to represent the variable a. 2π Remember: Period = b 8. Write an expression for the total number of minutes between midnight and sunrise in the form y = asin b( x + c) + d. You will need to use the variable values from the sinusoidal regression in order to calculate the value of b. TI-InterActive uses the notation yx ( ): = to define a function. In particular it is important to use the button. Michael Swanborough 6 Flinders Community Christian College, Victoria
7 9. Check the accuracy of your rule by using it to determine an approximate sunrise time for today. Use a Math Box and Math, Number, Fractional Part to determine the number of minutes. 10. Use either the Sun Cycle program or the newspaper to give the actual value. Comment on the accuracy of your rule. Michael Swanborough 7 Flinders Community Christian College, Victoria
8 PART 2 DETERMINING THE EQUATION FOR MELBOURNE S SUNSET 1. Prepare a statistical plot of the sunset data. 2. Calculate a sinusoidal regression to determine a model for the total number of minutes between midnight and sunset. 3. Graph this function on the same set of axes as the statistical plot of the data. 4. State the amplitude, period, horizontal and vertical translations of the function. 5. Write an expression for the total number of minutes between midnight and sunset in the form y = asin b( x + c) + d. 6. Check the accuracy of your rule by using it to determine an approximate sunset time for today. Use either the Sun Cycle program or the newspaper to give the actual value. Comment on the accuracy of your rule. 7. Compare the equations for sunrise and sunset. What factors are different and why? PART 3 DETERMINING THE EQUATION FOR NUMBER OF DAYLIGHT HOURS 1. Use the same process as outlined for finding the time of sunrise to determine the equation for the number of daylight hours for Melbourne. 2. Graph sunrise, sunset and daylight minutes on the same set of axes. 2. Use your rule to determine the dates of the summer and winter solstice. State the actual values of the summer and winter solstice and compare them with the results obtained from your rule. 3. Use your equation to determine the equinox dates. Comment on the accuracy of your results. 4. What is the average number of daylight hours per day for the whole year in Melbourne? Michael Swanborough 8 Flinders Community Christian College, Victoria
9 PART 4 GENERALIZING THE EQUATION FOR ANY POINT ON THE EARTH For this part of the investigation each member of the class will use the longitude 140 East and the corresponding time zone +10 hours. 1. Select one of the following pairs of latitudes: 50 N and 50 S ; 40 N and 40 S; 30 N and 30 S, 20 N and 20 S or 10 N and10 S. 2. Use the Sun Cycle program to compile a table of sunrise, sunset and daylight minutes for the latitudes selected. 3. Determine the equations, in the form y = asin b( x + c) + d, for the number of daylight minutes for the latitudes selected. State the amplitude, period, horizontal translation and vertical translation in each case. Test your equation and comment on its accuracy. 4. Graph the daylight minutes for the Northern and Southern hemispheres for your selected pair of latitudes on the same set of axes. 5. Compare the equation for the Northern hemisphere with that of the Southern hemispehere. What similarities are there? What differences are there? 6. Complete the table below, which summarises the results for each of the different latitudes. What significant features about the results do you notice? 7. Explain why a different longitude will have no effect on the daylight minutes equation. EXTENSION 1. Using the summary results obtained, propose a model for the equation for daylight minutes for a given latitude. 2. Comment on your results. Michael Swanborough 9 Flinders Community Christian College, Victoria
10 THE LIGHT SIDE OF TRIGONOMETRY SUMMARY TABLE Longitude: 140 East Time Zone: + 10 hours Latitude Amplitude Period Horizontal translation 50 N 40 N 30 N 20 N 10 N 0 10 S 20 S 30 S 40 S 50 S Vertical translation Equation Michael Swanborough 10 Flinders Community Christian College, Victoria
11 FLINDERS CHRISTIAN COMMUNITY COLLEGE MATHEMATICAL METHODS APPLICATION TASK GRADING SHEET Student name: Date: Outcome Criteria Marks available Outcome 1 1 Appropriate use of mathematical conventions, symbols 3 Define and explain key concepts as specified in the content of the and terminology areas of study, and apply a range of related mathematical routines 2 Definition and explanation of key concepts 4 and procedures. Marks given 11 marks Outcome 2 Apply mathematical processes in non-routine contexts and analyse and discuss these applications of mathematics. 3 Accurate application of mathematical skills and techniques 1 Identification of important information, variables and constraints 2 Application of mathematical ideas and content from the specified areas of study marks Outcome 3 Select and appropriately use technology to produce results and carry out analysis in situations requiring problem solving, modelling or investigative techniques or approaches. 3 Analysis and interpretation of results 6 1 Appropriate selection and effective use of technology 2 2 Application of technology 3 5 marks TOTAL 30 Comments A+ A B+ B C+ C D+ D E+ E UG Michael Swanborough 11 Flinders Community Christian College, Victoria
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