tag:blogger.com,1999:blog-7351124682213901690.comments2023-09-23T04:36:44.126-07:00The Urban AstronomerThe Urban Astronomerhttp://www.blogger.com/profile/08832236005805705235noreply@blogger.comBlogger363125tag:blogger.com,1999:blog-7351124682213901690.post-3767938622403901272023-09-22T10:34:21.547-07:002023-09-22T10:34:21.547-07:00I believe the question is: why does the change in ...I believe the question is: why does the change in length of day increase at the equinox vs the solstice? Or why do we loose sunlight faster at this time year?Sam Gnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-60674783598520709082023-06-28T21:41:28.477-07:002023-06-28T21:41:28.477-07:00Thank you for keeping up these posts! Maybe we wil...Thank you for keeping up these posts! Maybe we will “see” you at the big eclipse next year in the USA! We will be somewhere between Dallas and …. San Antonio??Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-13228960012876459602021-09-23T13:44:31.812-07:002021-09-23T13:44:31.812-07:00Thanks, Urban Astronomer.
I am wondering, more sp...Thanks, Urban Astronomer.<br /><br />I am wondering, more specifically, why does the rate of change vary? Why is the rate of change fastest at the equinox and slowest at the solstice?<br /><br />In the past, I've heard the lawn sprinkler analogy invoked. The sprinkler moves fastest when in the middle of it's arc across the land, and moves slowest at each end of it's arc where it has to change direction. The ends of the sprinkler arc would be the analogy for each solstice, where the change in daylight has to reverse direction (change in sign). And the middle of the sprinkler arc would be the analogy for the equinoxes.<br /><br />I get the analogy, but I would love a direct explanation.<br /><br />Any info you could offer would be much appreciated.<br /><br />best<br /><br />HunterAnonymoushttps://www.blogger.com/profile/06181537791848694170noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-65842898939903114912021-09-23T13:11:23.504-07:002021-09-23T13:11:23.504-07:00hi Jon - the changes in this situation are due to ...hi Jon - the changes in this situation are due to the tilt of the Earth on its axis of rotation. Because the top of the Earth's axis (essentially the North Pole) points to a fixed point in space (at Polaris, the North Star), as the Earth travels in its 12 month journey around the Sun we have a continuously changing orientation of the axis of the Earth. Sometimes the pole is leaning toward the Sun and we have Summer (in the northern hemisphere) and six months later the pole is leaning away from the Sun and we have Winter. As we are in-between these two extremes at the Fall or Spring Equinox, we have the unique situation that the entire planet Earth does not have summery and wintery parts, but all parts of the Earth are equally illuminated by the Sun, for 12 hours. A picture is worth 1000 words. Try this: https://www.sciencealert.com/the-september-equinox-is-this-tuesday-here-s-what-that-meansThe Urban Astronomerhttps://www.blogger.com/profile/08832236005805705235noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-70035187410859972172021-09-22T14:00:01.540-07:002021-09-22T14:00:01.540-07:00Sorry, can you simplyfy this explanation for us la...Sorry, can you simplyfy this explanation for us laymen? Is it to do with the earth's elliptical orbit of the sun?Jonnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-72663486849359049752021-07-13T04:25:54.484-07:002021-07-13T04:25:54.484-07:00Sterntaufe Awesome article, it was exceptionally h...<a href="https://galaxieregister.de/pages/sterntaufe" rel="nofollow">Sterntaufe</a> Awesome article, it was exceptionally helpful! I simply began in this and I'm becoming more acquainted with it better! Cheers, keep doing awesome!rohanhttps://www.blogger.com/profile/13970565571904836722noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-90955731131444407222020-10-21T14:17:38.351-07:002020-10-21T14:17:38.351-07:00Im my book, there is the summer triangle, the fall...Im my book, there is the summer triangle, the fall rectangle (basically Pegasus plus alpha And) and the winter hexagon (https://en.wikipedia.org/wiki/Winter_Hexagon). And looking for that link, I just learned about the Spring Triangle: https://en.wikipedia.org/wiki/Spring_Triangle.RKhttps://www.blogger.com/profile/06892525648426935302noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-58668883530838617532020-10-17T10:35:35.922-07:002020-10-17T10:35:35.922-07:00Break a leg Paul &-)
KenBreak a leg Paul &-)<br /><br />KenAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-16925154124522536762019-11-25T13:43:32.488-08:002019-11-25T13:43:32.488-08:00The Meteor Outburst was a dud. Here's a writeu...The Meteor Outburst was a dud. Here's a writeup explaining what happened: https://www.skyandtelescope.com/astronomy-blogs/explore-night-bob-king/dud-meteor-shower-showing-up/The Urban Astronomerhttps://www.blogger.com/profile/08832236005805705235noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-66312594191357704972019-11-14T20:34:53.670-08:002019-11-14T20:34:53.670-08:00Wonderful to see you back inspiring us :-)Wonderful to see you back inspiring us :-)Catenoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-57249336491732112072019-11-14T20:32:08.758-08:002019-11-14T20:32:08.758-08:00Thank you for this! Can’t wait to see them!Thank you for this! Can’t wait to see them!Cate Freyernoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-27473425911535802742018-01-10T05:36:16.177-08:002018-01-10T05:36:16.177-08:00It happens because the projection of circular moti...It happens because the projection of circular motion into one dimension follows the rules of simple harmonic motion. We can consider the change in the length of the day to be like velocity, which in SHM is at a maximum when the displacement is at a minimum. Leenoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-35034264523481325202017-12-16T18:43:29.094-08:002017-12-16T18:43:29.094-08:00thanks!
was just discussing the winter triangle w/...thanks!<br />was just discussing the winter triangle w/ friends, and wasn't positive of the 3rd star, procyon.<br /> your post helped!<br />Anonymoushttps://www.blogger.com/profile/08810379897453564258noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-69776819472973419592017-05-01T14:11:11.993-07:002017-05-01T14:11:11.993-07:00The great red spot is considerably darker this yea...The great red spot is considerably darker this year than in recent years, and thus easier to see. I've seen it through a 70 mm refractor at 93x magnification when the atmosphere here on Earth has been calm and steady. Anthony Barreironoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-7276225599550878362017-02-16T04:20:47.123-08:002017-02-16T04:20:47.123-08:00I made it a point to go out and look for this litt...I made it a point to go out and look for this little event. So glad you posted the great pics, because that's just what I saw! Thank you!Betsy Hudsonhttp://www.vernonacular.comnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-45493340170614377762016-09-28T13:31:49.028-07:002016-09-28T13:31:49.028-07:00Im so excited my property is on the direct line in...Im so excited my property is on the direct line in southern illinois in vienna Just southeast of carbondale<br />It will be awesome just pray for clear skiesJonThttps://www.blogger.com/profile/08891873538483650112noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-53105911965283486772016-02-21T05:37:25.081-08:002016-02-21T05:37:25.081-08:00Recently, I had the honor of working collaborative...Recently, I had the honor of working collaboratively with the astrophysics lab at Case Western Reserve University in taking a series of deep space images. The field had been having difficulty in filtering out the static found prevalent thus far. The resultant photos which interpret what telescopes were seeing, seem to be causing quite a stir in both the fine art and astronomy circles.<br /> Please refer to my LinkedIn profile, for further biographical data. -Marc Breed, Fine Artist Anonymoushttps://www.blogger.com/profile/10136051828955284186noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-12468678966589142472015-09-01T12:36:35.898-07:002015-09-01T12:36:35.898-07:00Maybe it's just me but i am sure that the Pers...Maybe it's just me but i am sure that the Perseid meteor shower has less meteors each year. Lucyphttp://ponderinglup.blogspot.co.uk/noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-81660188503492209642015-08-21T11:08:28.789-07:002015-08-21T11:08:28.789-07:00Good catch. It is actually on Tuesday 25th. I'...Good catch. It is actually on Tuesday 25th. I've updated the blog post. The Urban Astronomerhttps://www.blogger.com/profile/08832236005805705235noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-17851490918994225672015-08-21T10:38:30.249-07:002015-08-21T10:38:30.249-07:00You list the SFAA party at the Presidio as Saturda...You list the SFAA party at the Presidio as Saturday August 25th. The 25th isn't a Saturday. Is it the 29th?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-19112528206124397232015-02-21T07:40:45.630-08:002015-02-21T07:40:45.630-08:00Thank You! I was leaving work last night when I no...Thank You! I was leaving work last night when I noticed the spectacular view in the western sky. So glad to know now what I was looking at.Anonymoushttps://www.blogger.com/profile/10292969156540967414noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-3073983201218322192015-02-06T16:09:35.435-08:002015-02-06T16:09:35.435-08:00Just before dawn on Jan 28 and Jan 29, 2015, I can...Just before dawn on Jan 28 and Jan 29, 2015, I can see something setting in an arc in the NW sky of SF. It follows almost the same track as the moon, which sets earlier. It looks like a very bright star or perhaps a planet. It reaches the horizon just as full daylight arrives, so there is too much daylight to see it actually reach the horizon. I'm wondering what it is? Could it be Venus?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-12677001084396182912015-01-11T22:28:34.524-08:002015-01-11T22:28:34.524-08:00hi Nicole - the most important thing you need is c...hi Nicole - the most important thing you need is clear skies. So keep your eyes on the sky and as soon as a clear night arrives, grab your binoculars and look. I'm sure that you won't have a problem seeing the comet if you use the finder chart. <br /><br />And of course, darker skies are great, but this comet is quite nice even in city lights.<br /><br />Paul The Urban Astronomerhttps://www.blogger.com/profile/08832236005805705235noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-71072837924556706952015-01-11T15:08:27.905-08:002015-01-11T15:08:27.905-08:00Hello- I would like to get a pair of binoculars an...Hello- I would like to get a pair of binoculars and look for it, but it's been quite cloudy in the city all week. Wondering if I should try east bay or Marin to escape light pollution and perhaps gain some elevation. Any suggestions would be appreciated. Thanks!Anonymoushttps://www.blogger.com/profile/10192733160335172121noreply@blogger.comtag:blogger.com,1999:blog-7351124682213901690.post-25039225067798061222015-01-04T15:40:43.742-08:002015-01-04T15:40:43.742-08:00hi Paulie - agreed, it's nice to have a comet ...hi Paulie - agreed, it's nice to have a comet just show up and do what it is supposed to do without any fanfare, especially after the ISON fiasco :-)<br /><br />I planned an early morning star party to see ISON in all of its brilliance after the Thanksgiving 2013 pass around the Sun and was so disappointed that it disintegrated! <br /><br />Enjoy the skies in the coming weeks, and stay warm!<br /><br />Paul The Urban Astronomerhttps://www.blogger.com/profile/08832236005805705235noreply@blogger.com