{"id":42911,"date":"2024-04-15T21:21:56","date_gmt":"2024-04-15T21:21:56","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=42911"},"modified":"2024-04-15T21:21:56","modified_gmt":"2024-04-15T21:21:56","slug":"the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/","title":{"rendered":"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of"},"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_6a9759c4c47d8\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    small, progressive changes in the earth&#039;s rotational speed                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    small, progressive change in earth&#039;s orbit around the sun                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"true\">\r\n                    both (a) and (b)                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    None of 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: C. both (a) and (b)<\/p>\n<p>The length of the tropical year is the time it takes for the Earth to orbit the <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            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> Sun once, relative to the vernal equinox. It is currently about 365.2422 days long.<\/p>\n<p>The Earth&#8217;s rotational speed is slowing down very gradually due to the tidal friction caused by the Moon&#8217;s gravity. This is causing the length of the day to increase by about 1.7 milliseconds per century.<\/p>\n<p>The Earth&#8217;s orbit around the Sun is also not perfectly circular. It is slightly elliptical, with an eccentricity of about 0.0167. This means that the Earth&#8217;s distance from the Sun varies by about 3% throughout the year.<\/p>\n<p>The combination of these two effects is causing the length of the tropical year to decrease very slowly. The current rate of decrease is about 0.002 seconds per century.<\/p>\n<p>Here is a more detailed explanation of each option:<\/p>\n<ul>\n<li>Option A: small, progressive changes in the earth&#8217;s rotational speed.<\/li>\n<\/ul>\n<p>The Earth&#8217;s rotational speed is slowing down very gradually due to the tidal friction caused by the Moon&#8217;s gravity. This is causing the length of the day to increase by about 1.7 milliseconds per century. The tidal friction is caused by the difference in the gravitational pull of the Moon on the near and far sides of the Earth. This difference in gravitational pull causes the Earth to bulge out slightly on the side facing the Moon. The bulge creates a tidal force that slows down the Earth&#8217;s rotation.<\/p>\n<ul>\n<li>Option B: small, progressive change in earth&#8217;s orbit around the sun.<\/li>\n<\/ul>\n<p>The Earth&#8217;s orbit around the Sun is also not perfectly circular. It is slightly elliptical, with an eccentricity of about 0.0167. This means that the Earth&#8217;s distance from the Sun varies by about 3% <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> throughout the year. The Earth&#8217;s distance from the Sun is at its closest point (perihelion) in January and at its farthest point (aphelion) in July.<\/p>\n<p>The Earth&#8217;s orbit is also affected by the gravitational pull of the other planets in the solar system. These gravitational interactions cause the Earth&#8217;s orbit to change very slowly over time. The Earth&#8217;s orbit is currently getting more elliptical, which means that the Earth&#8217;s distance from the Sun is increasing slightly.<\/p>\n<ul>\n<li>Option C: both (a) and (b).<\/li>\n<\/ul>\n<p>The combination of the Earth&#8217;s slowing rotation and its slightly elliptical orbit is causing the length of the tropical year to decrease very slowly. The current rate of decrease is about 0.002 seconds per century.<\/p>\n<ul>\n<li>Option D: None of the above.<\/li>\n<\/ul>\n<p>This option is incorrect because it does not include both of the factors that are causing the length of the tropical year to decrease.<\/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":[958],"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 length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of\" \/>\n<meta property=\"og:description\" content=\"Join Our Telegram Channel Subscribe on YouTube\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T21:21:56+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/","og_locale":"en_US","og_type":"article","og_title":"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of","og_description":"Join Our Telegram Channel Subscribe on YouTube","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T21:21:56+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/","name":"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2024-04-15T21:21:56+00:00","dateModified":"2024-04-15T21:21:56+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-length-of-the-tropical-years-the-time-interval-between-successive-occurrences-of-the-spring-equinox-is-decreasing-very-slowly-as-a-result-of\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"World geography","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/world-geography\/"},{"@type":"ListItem","position":3,"name":"The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/d97f17072bfa490596c8f78363955d55?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d97f17072bfa490596c8f78363955d55?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/42911"}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=42911"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/42911\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=42911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=42911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=42911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}