{"id":5529,"date":"2020-02-24T19:25:01","date_gmt":"2020-02-24T18:25:01","guid":{"rendered":"http:\/\/www.astronom.cz\/horalek\/?p=5529"},"modified":"2020-02-27T18:47:39","modified_gmt":"2020-02-27T17:47:39","slug":"two-hemispheres-sky","status":"publish","type":"post","link":"https:\/\/www.petrhoralek.com\/?p=5529","title":{"rendered":"Two hemispheres sky"},"content":{"rendered":"<p><div id=\"attachment_5551\" style=\"width: 398px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-5551\" src=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px-820x1024.png\" alt=\"Circle of Zodiac\" width=\"388\" height=\"485\" class=\"size-large wp-image-5551\" srcset=\"https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px-820x1024.png 820w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px-240x300.png 240w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px-768x959.png 768w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px-520x649.png 520w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_ZLCircle_viz_1500px.png 1201w\" sizes=\"(max-width: 388px) 100vw, 388px\" \/><\/a><p id=\"caption-attachment-5551\" class=\"wp-caption-text\">Circle of Zodiac<\/p><\/div>Two photographers, two hemispheres, one sky. The view to the night sky is limited by our Earth, meaning in one time at one place we can only see a half of the starry spheric view, the second one is below the horizon. But what if  &#8211; apart from travelling away from Earth &#8211; there is a way to complete the whole view. Then it could look like this. Of course, some (better precise) planning is needed to make it happen. You have to think about what follows what and when is the time of view following the other view from the other hemisphere. Me and my friend, great <a href=\"http:\/\/www.twanight.org\/newTWAN\/photographers_about.asp?photographer=Juan%20Carlos%20Casado\" rel=\"noopener noreferrer\" target=\"_blank\">TWAN photographer Juan Carlos Casado<\/a>, focused on specific part of the year, when from two major observatories of almost same latitude, but opposite ways from equator, the column of the zodiacal light appears almost upright over the horizon. While mine view from <a href=\"https:\/\/www.eso.org\/\" rel=\"noopener noreferrer\" target=\"_blank\">ESO<\/a> La Silla Observatory was taken in April (2016), Juan made it happen to capture the northern part from <a href=\"https:\/\/www.iac.es\/\" rel=\"noopener noreferrer\" target=\"_blank\">IAC<\/a> La Palma Observatory on February (2020). Both views, sitched together in one, finally reveal the whole night sky scene around, using Earth&#8217;s horizon to block the bright sun from the view. Here are some of more interesting facts:<\/p>\n<div id=\"attachment_5535\" style=\"width: 398px\" class=\"wp-caption alignright\"><a href=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-5535\" src=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz-671x1024.png\" alt=\"Zodiac path from north to south\" width=\"388\" height=\"592\" class=\"size-large wp-image-5535\" srcset=\"https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz-671x1024.png 671w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz-197x300.png 197w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz-768x1172.png 768w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz-520x793.png 520w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_TravMarc2_1500px_viz.png 983w\" sizes=\"(max-width: 388px) 100vw, 388px\" \/><\/a><p id=\"caption-attachment-5535\" class=\"wp-caption-text\">Zodiac path from north to south<\/p><\/div>\n<ul>\n<li>Both observatories lie at altitude about 2400 meters and latitude 29 degrees (La Palma north, La Silla south)<\/li>\n<li>Southern part (La Silla) was taken on 13 April 2016, morning (a month after <a href=\"https:\/\/en.wikipedia.org\/wiki\/Equinox\" rel=\"noopener noreferrer\" target=\"_blank\">vernal eqionox<\/a>). Northern part (La Palma) almost perfectly to fit &#8211; evening of 20 February 2020 (month before vernal equinox)<\/li>\n<li>On northern part (Casado) can be seen prominent reddish <a href=\"https:\/\/www.atoptics.co.uk\/highsky\/airglow2.htm\" rel=\"noopener noreferrer\" target=\"_blank\">airglow<\/a> from OH radicals, which is mostly visible after dusk, southern one (Hor\u00e1lek) shines with green (oxygen) airglow of which visibility is favorable <a href=\"https:\/\/www.atoptics.co.uk\/highsky\/airglim2.htm\" rel=\"noopener noreferrer\" target=\"_blank\">also in mornings<\/a> before dawn.<\/li>\n<li>Same equipment gave same resolution and same spectral sensitivity so HII regions are visible in both images. For both views were used modified Canon 6D cameras, 24mm lenses, f2.2, ISO 10000 and 15s exposures stitched to panorama. Most prominent HII regions are, of course &#8211; <a href=\"https:\/\/en.wikipedia.org\/wiki\/Gum_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">Gum nebula<\/a> (behind <a href=\"https:\/\/en.wikipedia.org\/wiki\/MAGIC_(telescope)\" rel=\"noopener noreferrer\" target=\"_blank\">MAGIC telescope<\/a>), <a href=\"https:\/\/en.wikipedia.org\/wiki\/Barnard%27s_Loop\" rel=\"noopener noreferrer\" target=\"_blank\">Barnard&#8217;s Loop<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Orion_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">Orion Nebula<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Rosette_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">Rosetta Nebula<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/California_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">California Nebula<\/a>, <a href=\"https:\/\/www.nasa.gov\/mission_pages\/WISE\/multimedia\/wiseimage20100524.html\" rel=\"noopener noreferrer\" target=\"_blank\">Heart and Soul<\/a>&#8230; (Casado, north), <a href=\"https:\/\/en.wikipedia.org\/wiki\/Lagoon_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">Lagoon Nebula<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/NGC_6334\" rel=\"noopener noreferrer\" target=\"_blank\">Cat Paw Nebula<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Rho_Ophiuchi\" rel=\"noopener noreferrer\" target=\"_blank\">Rho Ophiuchi region<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Carina_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">Carina Nebula<\/a>, <a href=\"https:\/\/en.wikipedia.org\/wiki\/North_America_Nebula\" rel=\"noopener noreferrer\" target=\"_blank\">North America<\/a>&#8230; (Hor\u00e1lek, south)<\/li>\n<li>In this time of year the 2 northern and 2 southern galaxies, except the Milky Way, are visible to naked eye in dark sky (in Casado&#8217;s La Palma view <a href=\"https:\/\/en.wikipedia.org\/wiki\/Andromeda_Galaxy\" rel=\"noopener noreferrer\" target=\"_blank\">Andromeda galaxy<\/a> and <a href=\"https:\/\/en.wikipedia.org\/wiki\/Triangulum_Galaxy\" rel=\"noopener noreferrer\" target=\"_blank\">Triangulum galaxy<\/a>, in Hor\u00e1lek&#8217;s one from La Silla the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Magellanic_Clouds\" rel=\"noopener noreferrer\" target=\"_blank\">Magellanic clouds<\/a>)<\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Gegenschein\" rel=\"noopener noreferrer\" target=\"_blank\">Gegenschein<\/a> can be seen as well &#8211; as a faint both-hemispheres belt 180 deg. away from <a href=\"https:\/\/www.youtube.com\/watch?v=eoFn_YLqFpQ\" rel=\"noopener noreferrer\" target=\"_blank\">Zodiacal Light<\/a> columns<\/li>\n<li>Domes of one of world&#8217;s largest telescopes can be seen: <a href=\"http:\/\/www.gtc.iac.es\/\" rel=\"noopener noreferrer\" target=\"_blank\">Grand Telescopio Canarias<\/a> (Casado, behind MAGIC telescope) and <a href=\"https:\/\/www.eso.org\/sci\/facilities\/lasilla\/telescopes\/3p6.html\" rel=\"noopener noreferrer\" target=\"_blank\">ESO 3.6 Telescope<\/a> (Hor\u00e1lek, behind dome of New Technology Telescope)<\/li>\n<\/ul>\n<p>The images would not have been taken without support of <a href=\"https:\/\/www.eso.org\/\" rel=\"noopener noreferrer\" target=\"_blank\">ESO<\/a> &#8211; European Southern Observatory, <a href=\"https:\/\/www.iac.es\/\" rel=\"noopener noreferrer\" target=\"_blank\">IAC<\/a> &#8211; Institute of Astrophysics of the Canary Islands and <a href=\"http:\/\/twanight.org\/newTWAN\/index.asp\" rel=\"noopener noreferrer\" target=\"_blank\">TWAN<\/a> &#8211; The World At Night. Full credit of all images is <i>Petr Hor\u00e1lek\/ESO, Juan Carlos Casado\/IAC\/TWAN<\/i>.<\/p>\n<div id=\"attachment_5532\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-5532\" src=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-1024x512.png\" alt=\"Two hemispheres sky\" width=\"800\" class=\"size-large wp-image-5532\" srcset=\"https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-1024x512.png 1024w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-300x150.png 300w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-768x384.png 768w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-96x47.png 96w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz-520x260.png 520w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Final_1800px_viz.png 1800w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><p id=\"caption-attachment-5532\" class=\"wp-caption-text\">Two hemispheres sky<\/p><\/div>\n<div id=\"attachment_5534\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-5534\" src=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-1024x1024.png\" alt=\"Circle of Milky Way\" width=\"800\" class=\"size-large wp-image-5534\" srcset=\"https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-1024x1024.png 1024w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-150x150.png 150w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-300x300.png 300w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-768x768.png 768w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-52x52.png 52w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-111x111.png 111w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-72x72.png 72w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz-520x520.png 520w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_FF_1500px_viz.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><p id=\"caption-attachment-5534\" class=\"wp-caption-text\">Circle of Milky Way<\/p><\/div>\n<div id=\"attachment_5533\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz.png\"><img decoding=\"async\" aria-describedby=\"caption-attachment-5533\" src=\"http:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz-1024x724.png\" alt=\"Celestial Infinity\" width=\"800\" class=\"size-large wp-image-5533\" srcset=\"https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz-1024x724.png 1024w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz-300x212.png 300w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz-768x543.png 768w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz-520x368.png 520w, https:\/\/www.petrhoralek.com\/wp-content\/uploads\/2020\/02\/2016April_2020February_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_88Shape_1500px_viz.png 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><p id=\"caption-attachment-5533\" class=\"wp-caption-text\">Celestial Infinity<\/p><\/div>\n<p><strong>Enjoy also Virtual Reality<\/strong><\/p>\n<p><iframe allowfullscreen style=\"border-style:none;\" allowfullscreen height=\"500\" src=\"https:\/\/www.petrhoralek.com\/pannellum\/pannellum.htm#panorama=2016(April)_2020(February)_LaSilla_LaPalma_ZL_MW_Hemispheres_Horalek_Casado_EQ_Facebook_viz.jpg&#038;autoRotate=-2&#038;autoLoad=true\" width=\"800\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Two photographers, two hemispheres, one sky. The view to the night sky is limited by our Earth, meaning in one time at one place we can only see a half of the starry spheric view, the second one is below the horizon. But what if &#8211; apart from travelling away from Earth &#8211; there is&hellip; <br \/> <a class=\"read-more\" href=\"https:\/\/www.petrhoralek.com\/?p=5529\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":5535,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[8,7,1,12],"tags":[19,21],"class_list":["post-5529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-atmospheric-phenomena","category-landscape","category-milky-way","category-zodiacal-light-and-gegenschein","tag-european-southern-observatory","tag-virtual-reality"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/posts\/5529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5529"}],"version-history":[{"count":0,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/posts\/5529\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=\/wp\/v2\/media\/5535"}],"wp:attachment":[{"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5529"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5529"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.petrhoralek.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5529"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}