{"id":3345,"date":"2022-05-12T11:00:44","date_gmt":"2022-05-12T16:00:44","guid":{"rendered":"https:\/\/jonvoisey.net\/blog\/?p=3345"},"modified":"2022-05-12T11:00:44","modified_gmt":"2022-05-12T16:00:44","slug":"almagest-book-vii-ptolemys-star-alignments","status":"publish","type":"post","link":"https:\/\/jonvoisey.net\/blog\/2022\/05\/almagest-book-vii-ptolemys-star-alignments\/","title":{"rendered":"Almagest Book VII: Ptolemy&#8217;s Star Alignments"},"content":{"rendered":"<p>Having laid out Hipparchus&#8217; alignment, Ptolemy offers several of his own<\/p>\n<blockquote><p>in order to provide those who come after us with a means of comparison.<\/p><\/blockquote>\n<p><!--more--><\/p>\n<blockquote><p><strong>Stars in Aries<\/strong>. The two northernmost [\u03b1 and \u03b2 Ari] of the three stars in the head of Aries [\u03b1, \u03b2, and \u03b3 Ari] and the bright star in the southern knee of Perseus [\u03b5 Per] and the star called Capella [\u03b1 Aur] lie on a straight line.<\/p>\n<p><strong>[Stars in Taurus.]<\/strong> The line drawn through the star Capella [\u03b1 Aur] and the bright star in the Hyades [\u03b1 Tau] cuts off the star in the advance leg of Auriga [\u03b9 Aur] a little to the east. Also, the star called Capella [\u03b1 Aur], the star which is common to the rearmost foot of Auriga and the tip of the northern horn of Taurus [\u03b2 Tau], and the star in the advance shoulder of Orion [\u03b3 Ori] lie on a straight line.<\/p>\n<p><strong>[Stars in Gemini.]<\/strong>\u00a0Furthermore, the [two] bright stars in the heads of Gemini [\u03b1 and \u03b2 Gem] and the bright star in the neck of Hydra [\u03b8 Hya] lie very nearly on a straight line.<\/p>\n<p><strong>[Stars in Cancer.]<\/strong> Furthermore, the two stars close together in the front leg of Ursa Major [\u03b9 and \u03ba UMa], the star on the tip of the northern claw of Cancer [\u03b9 Cnc], and the northernmost of the [two] &#8216;Aselli&#8217;<span id='easy-footnote-1-3345' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote'><a href='https:\/\/jonvoisey.net\/blog\/2022\/05\/almagest-book-vii-ptolemys-star-alignments\/#easy-footnote-bottom-1-3345' title='Aselli means &amp;#8220;donkeys&amp;#8221; and these are the two stars on the back of Cancer, \u03b3 and \u03b4, also known as Asellus Borealis and Asellus Australis respectively.'><sup>1<\/sup><\/a><\/span> [\u03b3 Cnc] lie on a straight line. Similarly, the southern Asellus [\u03b4 Cnc], the bright star Procyon [\u03b1 CMi], and the bright star between them (which is advance of the head of Hydra) [\u03b2 Cnc], lie almost on a straight line.<\/p>\n<p><strong>[Stars in Leo.]\u00a0<\/strong>Furthermore, the straight line drawn from the midmost star [\u03b3 Leo] of the [three] bright stars in the neck of Leo [\u03b6, \u03b3, and \u03b7 Leo] to the bright star in Hydra [\u03b1 Hya] cuts off the star on the heart of Leo [\u03b1 Leo] a little to the east. The [line] from the bright star in the rump of Leo [\u03b4 Leo] to the bright star [\u03b3 UMa] in the back thigh of Ursa Major (which is the southernmost star on the rear side of the quadrilateral), cuts off, a little to the west, the two stars which are close together in the rear paw of Ursa Major [\u03bd and \u03be UMa].<\/p>\n<p><strong>[Stars in Virgo.]\u00a0<\/strong>Furthermore, the line from the star in the back of the thigh of Virgo [\u03b6 Vir] to the second star from the tip of Hydra&#8217;s tail [\u03b3 Hya]cuts off the star called Spica [\u03b1 Vir] a little to the west. The line from Spica to the star in the head of Bootes [\u03b2 Boo] cuts off Arcturus [\u03b1 Boo] a little to the east. Spica and the [two] stars on the wings of Corvus [\u03b4 and \u03b3 Crv] lie on a straight line. Spica, the star in the back of Virgo&#8217;s thigh [\u03b6 Vir], and the northernmost, bright star [\u03b7 Boo] of the three in the advance knee of Bootes [\u03b7, \u03c4, and \u03bd Boo] lie on a straight line.<\/p>\n<p><strong>[Stars in Libra.]\u00a0<\/strong>Furthermore, the [two] bright stars in the claws [\u03b1 and \u03b2 Lib] and the star on the tip of Hydra&#8217;s tail [\u03c0 Hya] are very nearly on a straight line. The bright star in the southern claw [\u03b1 Lib], Arcturus [\u03b1 Boo], and the midmost [\u03b6 UMa] of the three stars in the tail of Ursa Major [\u03b5, \u03b6, and \u03b7 UMa] lie on a straight line. The bright star in the back of the thigh of Ursa Major [\u03b3 UMa] lie on a straight line.<\/p>\n<p><strong>[Stars in Scorpius.]\u00a0<\/strong>Furthermore, the star on the rear shin of Ophiuchus [\u03be Oph], the star in the fifth tail-joint of Scorpius [\u03b8 Sco], and the more advanced [\u03bd Sco] of the two stars close together in its sting [\u03bb and \u03bd Sco] lie on a straight line. The most advanced [\u03c3 Sco] of the three stars in the breast of Scorpius [\u03c3, \u03b1, and \u03c4 Sco], and the two stars in the knees of Ophiuchus [\u03b7 and \u03b6 Oph], form an isoceles triangle, the apex of which is the most advanced of the three stars int he breast [\u03c3 Sco].<\/p>\n<p><strong>[Stars in Sagittarius.]\u00a0<\/strong>Furthermore, the star on the front, southern hock of Sagittarius (which is of second magnitude) [\u03b2 Sgr], the star on the arrow-head [\u03b3 Sgr], and the star in the rear knee of Ophiuchus [\u03b7 Oph] lie on a straight line. The star [\u03b1 Sgr] in the knee of the same [front] leg of Sagittarius (which lies near Corona [Australis]), the star on the arrow-head [\u03b3 Sgr], and the star in the advance knee of Ophiuchus [\u03b6 Oph] lie on a straight line.<\/p>\n<p><strong>[Stars in Capricorn.]\u00a0<\/strong>Furthermore, the line drawn from the bright star in Lyra [\u03b1 Lyr] to the stars in the horns of Capricorn [\u03b1, \u03b2, \u03bd, and \u03be Cap] cuts off the bright star in Aquila [\u03b1 Aql] a little to the east. The line from the bright star in Aquila to the first-magnitude star int he mouth of Piscis Austrinus [\u03b1 PsA] bisects, approximately, the interval between the two bright stars on the tail of Capricorn [\u03b3 and \u03b4 Cap].<\/p>\n<p><strong>[Stars in Aquarius.]\u00a0<\/strong>Furthermore, the line from the first-magnitude star in the mouth of Piscis Austrinus [\u03b1 PsA] to the star in the muzzle of Pegasus [\u03b5 Peg] cuts off the bright star in the rear shoulder of Aquarius [\u03b1 Aqr], a little to the east.<\/p>\n<p><strong>[Stars in Pisces.]\u00a0<\/strong>Furthermore, the stars in the mouths of Piscis Austrinus [\u03b1 PsA] and the southern fish [of Pisces] [\u03b2 Psc] and the [two] advance stars of the quadrilateral in Pegasus [\u03b1 and \u03b2 Peg] lie on a straight line.<\/p><\/blockquote>\n<p>While the above alignments were all ones first reported by Ptolemy, he does note that he was able to check them in a limited extent against observations from Hipparchus because a<\/p>\n<blockquote><p>globe resulting from the observations made [in Hipparchus&#8217; time]<\/p><\/blockquote>\n<p>was available to Ptolemy, presumably at the Musaeum of Alexandria<span id='easy-footnote-2-3345' class='easy-footnote-margin-adjust'><\/span><span class='easy-footnote'><a href='https:\/\/jonvoisey.net\/blog\/2022\/05\/almagest-book-vii-ptolemys-star-alignments\/#easy-footnote-bottom-2-3345' title='Which included the Library of Alexandria.'><sup>2<\/sup><\/a><\/span>. Using this, he found that these alignments matched Hipparchus&#8217; celestial globe quite well further strengthening his argument that the stars did not appear to change positions.<\/p>\n<hr \/>\n<p><a href=\"https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-3347\" src=\"https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?resize=300%2C129&#038;ssl=1\" alt=\"\" width=\"300\" height=\"129\" srcset=\"https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?resize=300%2C129&amp;ssl=1 300w, https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?resize=1024%2C442&amp;ssl=1 1024w, https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?resize=768%2C331&amp;ssl=1 768w, https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?resize=1536%2C663&amp;ssl=1 1536w, https:\/\/i0.wp.com\/jonvoisey.net\/blog\/wp-content\/uploads\/2022\/05\/Almagest-Progress-20220512-1.png?w=1912&amp;ssl=1 1912w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Having laid out Hipparchus&#8217; alignment, Ptolemy offers several of his own in order to provide those who come after us with a means of comparison.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[24],"tags":[25,62,14],"class_list":["post-3345","post","type-post","status-publish","format-standard","hentry","category-almagest","tag-almagest","tag-constellations","tag-ptolemy"],"acf":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9ZpvC-RX","_links":{"self":[{"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/posts\/3345","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/comments?post=3345"}],"version-history":[{"count":2,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/posts\/3345\/revisions"}],"predecessor-version":[{"id":3348,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/posts\/3345\/revisions\/3348"}],"wp:attachment":[{"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/media?parent=3345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/categories?post=3345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jonvoisey.net\/blog\/wp-json\/wp\/v2\/tags?post=3345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}