{"id":389,"date":"2015-02-10T11:46:18","date_gmt":"2015-02-10T14:46:18","guid":{"rendered":"http:\/\/projects.upei.ca\/astronomy\/?p=389"},"modified":"2015-02-21T15:30:57","modified_gmt":"2015-02-21T18:30:57","slug":"movement-of-the-planets-including-earth-feb-14-and-21-2015","status":"publish","type":"post","link":"https:\/\/projects.upei.ca\/astronomy\/2015\/02\/10\/movement-of-the-planets-including-earth-feb-14-and-21-2015\/","title":{"rendered":"Movement of the Planets (including Earth), Feb 14 and 21, 2015"},"content":{"rendered":"

Edit:Feb 21 (2pm): Weather not improving.\u00a0 According to the Charlottetown Clear Sky Chart<\/a>, we’ll have poor transparency (water vapour in atmosphere so would get fuzzy image) and increasing clouds over the evening.\u00a0 This month’s viewing cancelled.
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\"ClearSkyFeb212015\"<\/a><\/p>\n

And just because I was curious as to how much “sun” (or lack of) we get in Charlottetown, I did some checking.\u00a0 According to www.weatherstats.ca<\/a>, Charlottetown is number 19 out of 100 cities in Canada for the least amount of sunshine.\u00a0 So glad we’re not number 1. Comparing nearby cities, St. John’s, NL is number 5, Truro is number 11 and Halifax is 51.<\/p>\n

Edit: Feb 20 (11am): Current weather forecast is for clouds cover starting about 4pm on Saturday. \u00a0Still tentatively on for now. \u00a0Further update by Saturday 5:30pm.\u00a0<\/strong><\/del><\/p>\n

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Edit: Feb 14 (5:39pm): This evening’s session cancelled due to the overcast skies.\u00a0 Based on satellite images, it looks like an even thicker cloud cover than now moving in in the next hours.\u00a0 We’ll try to have it on the 21st.<\/strong><\/p>\n

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We’re still pinning down some volunteers for potential astronomy sessions on Feb 14 (alternate date Feb 21st if needed).\u00a0 With the weather being so cold, it’s harder to rotate the dome and the electronics on our telescopes also don’t work as well.\u00a0 Check out this site (and phone message at 902-566-0745) after 5:30pm to make sure the session is running.<\/p>\n

Generally — if the sky is more than 25% covered or the weather forecast is for clouds moving strongly in, or there’s precipitation (snow or rain) or it’s really REALLY cold (e.g. -20C), then we could post-pone it to Feb 21st.\u00a0 Currently there’s a lot of snow forecast for Friday Feb 13th and that could also cause issues.<\/p>\n

With that out of the way, I’d like to give you an idea of what sort of things we could be looking at that evening.<\/p>\n

Just after 7pm, there’s a chance to see Venus and Mars near the horizon (Uranus very very faint). Two things about the Stellarium generated image below — it’s a good example of how the planets are mostly in “a line” with respect to each other.\u00a0 They’re not perpendicular as the Earth’s rotation axis is tilted with respect to the plane in which the planets rotate.\u00a0 The second… because we’re in the city and our dome is surrounded by buildings and vegetation, we may not be able to see any of these planets at all as Mars and Venus may be blocked from view and Uranus is likely too faint.\u00a0 That’s where taking a portable telescope to near a dark beach (or other flat location) can really shine.<\/p>\n

\"Venus<\/a>

Venus, Mars and Uranus (showing planetary orbit paths, about 7:15pm Feb 14 2015)<\/p><\/div>\n

As the evening progresses, Venus and Mars move below the horizon, leaving only the very faint Uranus a possibility if you’ve got a really nice dark sky, a still air mass and a good telescope.<\/p>\n

Curious why Venus’ orbital path doesn’t continue on with that of Mars and Uranus?\u00a0 It’s because Venus is closer to the Sun than the Earth, so we “pass” it and it seems to reverse direction as it falls behind.\u00a0 (Some excellent Flash-based labs here.)<\/a><\/p>\n

\"Uranus<\/a>

Uranus, Feb 14 (about 8:45pm), Mars and Venus below the horizon<\/p><\/div>\n

If we end up post-poning a week, Mars and Venus move a lot closer together (from our viewpoint on the Earth), but still very low to the horizon. We’ll also have a nice sliver of moon available.<\/p>\n

\"Venus<\/a>

Venus, Mars and the Moon, Feb 21 2015 (about 7:15pm)<\/p><\/div>\n

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A likely “star” or rather “planet” attraction for the evening, whether it’s on the 14th or 21st would be Jupiter instead.\u00a0 Further up from the horizon, bright and a gorgeous planet to view.<\/p>\n

\"Jupiter<\/a>

Jupiter Feb 14 2015 (about 7:15pm)<\/p><\/div>\n

\"Jupiter<\/a>

Jupiter, Feb 21 2015 (about 7:15pm)<\/p><\/div>\n

Here’s to a good viewing.<\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

Edit:Feb 21 (2pm): Weather not improving.\u00a0 According to the Charlottetown Clear Sky Chart, we’ll have poor transparency (water vapour in atmosphere so would get fuzzy image) and increasing clouds over the evening.\u00a0 This month’s viewing cancelled. And just because I … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_jetpack_memberships_contains_paid_content":false,"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[6],"tags":[],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/posts\/389"}],"collection":[{"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/users\/51"}],"replies":[{"embeddable":true,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/comments?post=389"}],"version-history":[{"count":14,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/posts\/389\/revisions"}],"predecessor-version":[{"id":415,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/posts\/389\/revisions\/415"}],"wp:attachment":[{"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/media?parent=389"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/categories?post=389"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/projects.upei.ca\/astronomy\/wp-json\/wp\/v2\/tags?post=389"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}