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sunrise during summer time
hi,
i was camping in yellowstone NP three weeks ago. for the first time in quite a while, i was able to observe sunrise and starry night. one thing i noticed is that by comparing the location of Polaris at night and that of the sunrise in the morning, i noticed they're in the same general direction. later on, when i came back from the trip, i found out at that location(details below), sun is rising from NE to E direction, instead of East can someone explain to me why sun is rising from NE instead of East in summertime? Grant Village at Yellowstone: latitude: 44=A1=E3 23.64' N longtitude: 110=A1=E3 33.35' W timezone: -7 hours =20 altitude: 8000ft (2600 meter) time: 7/06/2005 11pm ~ 7/07/2005 6am |
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In article . com,
wrote: i was camping in yellowstone NP three weeks ago. for the first time in quite a while, i was able to observe sunrise and starry night. one thing i noticed is that by comparing the location of Polaris at night and that of the sunrise in the morning, i noticed they're in the same general direction. later on, when i came back from the trip, i found out at that location(details below), sun is rising from NE to E direction, instead of East can someone explain to me why sun is rising from NE instead of East in summertime? Well, think of it this way: in summer the Sun is above the horizon longer. The Sun appears to travel one full revolution around you in 24 hours. In 6 hours it appears to travel from south to west. So if the SUn is above the horizon more than 6 hours after (solar) noon, it must set northward of west. Let's go to the extreme case: suppose you're camping out right at the north actic circle on the day of the summer solstice. Then we have midnight sun: the sun just touches the horizon before it starts rising again - you can consider this as if the sun sets for a moment and then rises. Where does this happen? In the east? No. In the west? No. It happens right in the north! -- ---------------------------------------------------------------- Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN e-mail: pausch at stockholm dot bostream dot se WWW: http://stjarnhimlen.se/ |
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thank you
that's a very good explaination, i can vividly display it in my mind, it explains i asked the question because according to my high school geology class, i remember the sun is always moving between northern and southern tropic of cancer, i remeber it's 22.5 degrees. and since yellowstone is at 45 degree latitude, i picture it from that location, i should have observed the sun is rising from east/southeast since i'm above the tropic of cancer. but i didn't thought 'the line of demarcation'. now it all makes sense. by that same token, during winter time between autumnal equinox and vernal equinox, at northern hemsphere, i should observe the sun is rising from southeast direction, right? |
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Barry Schwarz wrote: On 3 Aug 2005 16:17:30 -0700, wrote: thank you that's a very good explaination, i can vividly display it in my mind, it explains i asked the question because according to my high school geology class, i remember the sun is always moving between northern and southern tropic of cancer, i remeber it's 22.5 degrees. and since yellowstone is at 45 degree latitude, i picture it from that location, i should have observed the sun is rising from east/southeast since i'm above the tropic of cancer. but i didn't thought 'the line of demarcation'. now it all makes sense. by that same token, during winter time between autumnal equinox and vernal equinox, at northern hemsphere, i should observe the sun is rising from southeast direction, right? It doesn't matter which hemisphere you are in. To anyone looking, the sunrise appears south of east during this period (except for those folks close to the north pole where it doesn't rise at all and those close to the south pole where it didn't set the day before). Remove the del for email The replies are all simply incredible for their vacuousness and totally incorrect !. Imagining variations in Equatorial/axial tilt to the Sun or paying attension to geocentric terms such as 'sunrise' for anything other than civil purposes is so destructive to astronomy,climatology or any other discipline where the motions of the Earth are required. A thousand way to say the few same things - The Sun does NOT vary its altitude against the Earth's Equator/axis. The change in orbital orientation due to the Earth's orbital motion around the Sun passing through a fixed axial orientation causes the hemispherical illusion of axial tilt and the change in the position of the Sun wrt to the axis/Equator. There is absolutely no way whatsoever that responsible people would not notice that the only way to resolve daylight/darkeness asymmetry or cyclical seaonal variations using a global perspective would miss the point that hemispherical axial tilt as a solution cannot be invoked when even amateur cataloguers know that beyond the fact that axial orientation is more or less fixed over the course of an annual orbit. http://homepage.mac.com/tarashnat/as.../0001-08a.jpeg Probably even more important than the day/night cycle,it is something else to see so many who are unfamiliar with the seasonal cycle using the astronomical/global perspective.There is no problem if people are initially unfamiliar or uncomfortable with the correct designation using orbital motion and orientation as the cause but the insistence to include axial tilt or variations in the Sun's position to the tilt/Equator is incredible for it silliness and to defend it or dither around is a sign of incompetence. |
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