{"id":8187,"date":"2024-04-15T02:56:24","date_gmt":"2024-04-15T02:56:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=8187"},"modified":"2024-04-15T02:56:24","modified_gmt":"2024-04-15T02:56:24","slug":"the-hour-angle-of-the-heavenly-body-for-greenwich-meridian-equals-the-hour-angle-of-the-body-for-any-other-meridian-longitude-a-mean-sun-b-true-sun-c-vernal-equinox-d-all-the-above","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-hour-angle-of-the-heavenly-body-for-greenwich-meridian-equals-the-hour-angle-of-the-body-for-any-other-meridian-longitude-a-mean-sun-b-true-sun-c-vernal-equinox-d-all-the-above\/","title":{"rendered":"The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude: A. Mean sun B. True sun C. Vernal equinox D. All the above"},"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_6a9c349201ef0\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"true\">\r\n                    Mean sun                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    True sun                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    Vernal equinox                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    All the above                <\/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: <strong>A. Mean sun<\/strong><\/p>\n<p>The hour angle of a heavenly body is the angle between the meridian of the observer and the meridian of the body, measured eastward from the observer&#8217;s meridian along the celestial equator. The hour angle of the mean sun for Greenwich meridian equals the hour angle of the body for any other meridian plus longitude.<\/p>\n<p>The mean sun is a fictitious sun that moves across the sky at a constant rate. It is used to define the mean solar day, which is the average time it takes for the Earth to rotate once on its axis. The mean solar day is 24 hours long, but it is not exactly 24 hours long <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n        <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div>     Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> because the Earth&#8217;s rotation is slowing down very slowly.<\/p>\n<p>The true sun is the actual sun. It moves across the sky at a variable rate because the Earth&#8217;s orbit around the Sun is not a perfect circle. The true solar day is therefore slightly longer than the mean solar day.<\/p>\n<p>The vernal equinox is the first day of spring in the Northern Hemisphere. It occurs when the Sun crosses the equator from south to north. The vernal equinox is not relevant to the question of the hour angle of a heavenly body.<\/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>The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude: A. Mean sun B. True sun C. Vernal equinox D. 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