{"id":8357,"date":"2024-04-15T02:59:16","date_gmt":"2024-04-15T02:59:16","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=8357"},"modified":"2024-04-15T02:59:16","modified_gmt":"2024-04-15T02:59:16","slug":"for-any-star-to-be-a-circumpolar-star-its-a-declination-must-be-0a-b-declination-must-be-90a-c-distance-from-the-pole-must-be-less-than-the-latitude-of-the-observer-d-hour-angle-must","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/for-any-star-to-be-a-circumpolar-star-its-a-declination-must-be-0a-b-declination-must-be-90a-c-distance-from-the-pole-must-be-less-than-the-latitude-of-the-observer-d-hour-angle-must\/","title":{"rendered":"For any star to be a circumpolar star, its A. Declination must be 0\u00c2\u00b0 B. Declination must be 90\u00c2\u00b0 C. Distance from the pole must be less than the latitude of the observer D. Hour angle must be 180\u00c2\u00b0"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a981822c0a26\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    Declination must be 0\u00c2\u00b0                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    Declination must be 90\u00c2\u00b0                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"true\">\r\n                    Distance from the pole must be less than the latitude of the observer                <\/div>\r\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    Hour angle must be 180\u00c2\u00b0                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is: C. Distance from the pole must be less than the latitude of the observer.<\/p>\n<p>A circumpolar star is a star that remains visible in the night sky throughout the year from a particular location on Earth. This is because the star&#8217;s declination is greater than or equal to the observer&#8217;s latitude. The declination of a star is its angular distance north or south of the celestial equator. The celestial equator is an imaginary line in the sky that lies directly above the Earth&#8217;s equator. The latitude of a location on Earth is its angular distance north or south of the Earth&#8217;s equator.<\/p>\n<p>For example, if an observer is located at a latitude of 40 degrees north, then any star with a declination of 40 degrees or greater will be circumpolar for that observer. This is because the star&#8217;s declination is greater than the observer&#8217;s latitude, so the star will always be above the horizon.<\/p>\n<p>The other options are incorrect. Option A is incorrect because the declination of a circumpolar star does not need to be 0 degrees. For example, the star Polaris has a declination of 89.2 degrees, and it is circumpolar for all observers located north of the Arctic Circle. Option B is incorrect because the declination of a circumpolar star does not need to be 90 degrees. For example, the star Vega has a declination of 38.7 degrees, and it is circumpolar for all observers located north of 51 degrees north latitude. Option D is incorrect because the hour angle of a star is the angle between the star&#8217;s right ascension and the observer&#8217;s local meridian. The hour angle of a circumpolar star does not need to be 180 degrees.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[654],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>For any star to be a circumpolar star, its A. Declination must be 0\u00c2\u00b0 B. Declination must be 90\u00c2\u00b0 C. Distance from the pole must be less than the latitude of the observer D. 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