{"id":16849,"date":"2026-04-07T13:03:57","date_gmt":"2026-04-07T07:33:57","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16849"},"modified":"2026-04-07T13:03:58","modified_gmt":"2026-04-07T07:33:58","slug":"artemis-ii-update-from-n2yo-com","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/artemis-ii-update-from-n2yo-com\/","title":{"rendered":"ARTEMIS II Update from N2YO.COM!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/LPzv0pMsZFQ?si=Qu4w4fpp84BYeGPD\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Sidereal time is a &#8220;star-based&#8221; timekeeping system used by astronomers to measure Earth&#8217;s rotation relative to fixed stars rather than the Sun. A sidereal day lasts 23 hours, 56 minutes, and 4 seconds\u2014approximately 4 minutes shorter than a standard solar day\u2014because it measures a precise 360\u00b0 rotation. <br><strong>Key Details About Sidereal Time<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Definition: It is the time it takes for the Earth to rotate once on its axis so that a distant star appears in the same position in the sky.<\/li>\n\n\n\n<li>Why It&#8217;s Different: While a solar day is based on the Sun returning to the same meridian (24 hours), a sidereal day is one full 360\u00b0 rotation. Because Earth moves along its orbit, it must rotate slightly more than 360\u00b0 for the Sun to return to the same spot, making a solar day slightly longer.<\/li>\n\n\n\n<li>Astronomical Usage: Astronomers use this time because any given star will transit (cross) the same meridian at the same sidereal time throughout the year, allowing them to locate stars easily.<\/li>\n\n\n\n<li>How it Works: One sidereal day is equal to 23 hours, 56 minutes, and 4.09 seconds. This results in sidereal clocks losing roughly 4 minutes per solar day.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Components of Sidereal Time<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sidereal Day: 24 sidereal hours, divided into 1,440 sidereal minutes, and 86,400 sidereal seconds.<\/li>\n\n\n\n<li>Sidereal Year: An external observer sees the Earth complete one extra rotation during its orbit around the Sun, resulting in 366.24 sidereal days per year.<\/li>\n\n\n\n<li>Hour Angle: Sidereal time can be defined as the hour angle of the vernal equinox, a reference point in the sky. <\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Sidereal time is a &#8220;star-based&#8221; timekeeping system used by astronomers to measure Earth&#8217;s rotation relative to fixed stars rather than the Sun. A sidereal day lasts 23 hours, 56 minutes, and 4 seconds\u2014approximately 4 minutes shorter than a standard solar day\u2014because it measures a precise 360\u00b0 rotation. Key Details About Sidereal Time Components of Sidereal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16851,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16849","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ARTEMIS II Update from N2YO.COM! - Johnson&#039;s Techworld<\/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:\/\/johnsonfrancis.org\/techworld\/artemis-ii-update-from-n2yo-com\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ARTEMIS II Update from N2YO.COM! - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Sidereal time is a &#8220;star-based&#8221; timekeeping system used by astronomers to measure Earth&#8217;s rotation relative to fixed stars rather than the Sun. A sidereal day lasts 23 hours, 56 minutes, and 4 seconds\u2014approximately 4 minutes shorter than a standard solar day\u2014because it measures a precise 360\u00b0 rotation. Key Details About Sidereal Time Components of Sidereal [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/artemis-ii-update-from-n2yo-com\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-07T07:33:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-07T07:33:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/04\/ARTEMIS-II-Update-from-N2YO.COM_.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1203\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"ARTEMIS II Update from N2YO.COM!\",\"datePublished\":\"2026-04-07T07:33:57+00:00\",\"dateModified\":\"2026-04-07T07:33:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/\"},\"wordCount\":253,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/ARTEMIS-II-Update-from-N2YO.COM_.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/artemis-ii-update-from-n2yo-com\\\/\",\"name\":\"ARTEMIS II Update from N2YO.COM! 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