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Question: covers the same field of view as originally in part...

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covers the same field of view as originally in part a. Now the two coins present the same apparent angular size. Which coin, the larger or smaller, was closer to your eye? d. What is the maximum angular amount an observer can look above the horizon? e. If a celestial object is up from the ob- servers horizon, how many degrees above c. To the circle shown below draw lines of the horizon is the object? sight from position x to the edges of the circle. Measure the apparent angular size of the circle at position X and record below. Repeat for position Y f. If a celestial object is 30° above the hori- its position as the horizon. g. If a star is seen at the east point of the observers horizon, what angular amount above the horizon is the object? apparent angulare ize at X angular size at Y h. If the moon is 2/3 above the south point d. What are two reasons that a celestial ob- on the horizon, give its position in angular angle above horizon angle along horizon ject may have a large apparent angular size? e. Because the sun and moon have the same apparent angular size, we are occasionally able to enjoy the spectacular beauty of a total eclipse of the sun. If the sun is very much larger then the moon, why is it that i. If a planet is 10 above the horizon and they reent the sme apparent angulir 135 from the north point, give its posi- tion in terms of a fraction above the horizon and compass direction along size? f. If the moon is slowly moving away from the earth, what do you predict solar eclipses to be like in the distant future fraction above horizon compass direction along horizon 3. The horizon system is a particularly useful j. The diagram below shows the location of celestial objects in the sky. The position of the celestial object can be described in terms es. One angle is measured along the horizon eastward from a star in an observers sky, Determine the angle and fraction above the horizon, and the angle and compass direction ured upward from the point on the horizon below the object, See illustration on page 6 Based upon the above information complete or a. For an observer looking along his horizon what compass direction is 270° away from the north point? b. For an observer looking along his hori zon toward the east point, how many degrees are between the east point and north point? angle above horizon fraction above horizon ㅡㅡ ㅡ ㅡㅡㅡㅡㅡ ㅡ c. For an observer looking along his hori- zon what compass direction is 225° away from the north point? angle along horizon compass direction along horizonb. Measure and record the smallest angle i. An object K and an observer at X are formed between lines C and D at E. shown below. Draw a line indicating a line of sight to an object L that lies 35° below object K on the plane of the paper as viewed by the observer at X. c. Based upon the diagram, what is the angle formed at point G between points F and H? j. Below is shown a top view of part of the solar system with the location of certain planets. Based on this drawing, what is the angular separation between the sun and Mars as viewed from the earth? d. Which letter of part c marks the vertex of the angle? e. Draw a line perpendicular, forming a 90 angle, to the horizontal line shown above in part c at the position marked G t. Draw in the lines of sight and determine what is the angle formed at point X be- tween points I and J Mars earth Venus g. In the illustration below draw the lines of sight to each star from the observers head, and measure and indicate the angular separation seen by the observer for the two stars. (Assume the stars and observer lie in plane of the page) k. Repeat the same approach as in part for the planet Venus. 2 Another application of angular measurement in astronomy is measuring apparent angular size of celestial objects. Complete the follow- ing parts a fof this question. a, Hold a large coin, such as a quarter or half dollar, at arms length and position your- self so that it just covers an object in your field of view. Now move the coin toward your eye, does the apparent angular size of h. Is t likely that two stars will have the same apparent angular separation as viewed by an observer on two different planets orbiting different stars? Explain. the coin inerease or decrease? b. Standing in the same position as in part a, hold a smaller coin at arms length. Adjust the coins distance from your eye i il

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