--- In [email protected], gullible fool <[EMAIL PROTECTED]> wrote: > > > http://www.astronomycafe.net/qadir/q1795.html > > Will the equinoxes and solstices switch places in > 13,000 years because of the precession of the Earth's > rotation axis? > > No, there will be no swapping of the seasons and the > months of the year.
And no one said there would be. You are perhaps creating a strawman -- refuting something never suggested, and claiming that you have addressed the question at hand. Which is: does the position of the sun at VE receed at about 1 degree every 72 years, thus it reaches that point one day earlier on the calendar than it did 72 years earlier. This is not speculation. Its mainstream science. Long run, in 13000 years, the math will show VE to 180 degrees from where it is now. Maybe hard to swallow, but its the implication of well accepted celestial mechanics. > The precession of the equinoxes of the Earth is a > motion that causes the axis of the Earth's rotation to > remain FIXED at an angle of 23.5 degrees, however, it > rotates along a great circle with a period of 26,000 > years. On average 23.5 degrees but due to factors other than precesson it can vary +- 2 degrees or so. The result is that the two points where the > equator of the Earth intersect the ecliptic plane, the > vernal and autumnal equinoxes, precess westward along > the ecliptic by 360 degrees per 25,800 years or 50.26 > seconds of arc per year. This is also equal to 0.125 > seconds of arc per day or 0.008 seconds of time, so > that each day the synchronization between sidereal and > solar time slips a bit. Currently, the vernal equinox > which heralds the beginning of spring occurs in the > constellation of Pisces, but it is slowly moving > towards the constellation of Aquarius and will arrive > there in a few hundred years or so. yes. > The seasons of the year are produced by the tilt of > the axis of the Earth, and this tilt is not disturbed > by the precession, but remains exactly thsee same with > respect to the ecliptic plane. Thats fine, but you that has little to do with the point at hand: that the position of the sun at VE receeds at about 1 degree every 72 years, thus it reaches that point one day earlier on the calendar than it did 72 years earlier. >Currently in the > northern hemisphere, the Earth is tilted TOWARDS the > Sun by 23.5 degrees when the Earth is at its farthest > from the Sun ( aphelion ) in June, and we experiencer > summer. In the winter it is tilted AWAY from the Sun > today. Because our calendar year and its seasons are > tied to when the equinoxes occur, it automatically > keeps up with the precession, so that in 13,000 years > we will have the following situation: The axis of the > Earth will be tilted TOWARDS the Sun by 23.5 degrees > when the Earth is closest to the Sun ( perihelion) in > the northern hemisphere in JUNE, and tilted AWAY from > the Sun when it is closest to the Sun in December. > Each day, our calendar is gradually 'precessing' in > time by 0.008 seconds to keep up with the new > locations of the equinoxes and solstices so no matter > where we are in the precession cycle, winter will > always happen in December, and Summer in June. No argument. That is what I have been saying. > BUT > because in the northern hemisphere in 13,000 years we > will be closer to the Sun for our summer, and farther > for our winter, the severity of these seasons will be > slightly greater. Yes, long term climate cycles will be generated from the long-run variations of the distance of lattitudes to the sun. > What will also change is the constellation that the > summer solstice will be in. In 13,000 years the summer > solstice will travel 1/2 of a full cycle around the > zodiac. Yes exactly. As will the position of the sun at vernal equinox, it will rotate 180 degrees in 13000 years. The VE will be in tropical Virgo in 1300o years !!! WHICH IS THE ONE POINT I HAVE BEEN MAKING. Some have made large cognitive errors in reading my posts and have interpreted "The VE will be in tropical Virgo in 13000 years" to be "spring will be in fall". That is muddled reading and thinking, but is the distortion generating most of the rounds of recent posts. (Though in sideral systems, the ayanamsa will be 180 degrees and Jyotish will call tropical region of virgo "Pisces") >Will we still celebrate winter in December and > summer in June in the northern hemisphere? Yes, Of course. Who said anything different? > and we > will also see Orion as a summer constellation in > 13,000 years. Precession affects the background > constellations against which the Earth-Sun motion > plays itself out. >It does not affect the months during > which the seasons occur, Right. September sill be September. Summer/autumn weather (though other factors may modify this). > because these are constantly > being updated to keep the vernal equinox in March etc. WHOA! I agree with everything you have said up now. Earlier you said. > What will also change is the constellation that the > summer solstice will be in. In 13,000 years the summer > solstice will travel 1/2 of a full cycle around the > zodiac. Thus in 13000 years the VE will be 180 degrees from its current position in Pisces, shifting to virgo. In tropical view, virgo is "September" and the earth is comimg out of summer (when N Hem. is tilted towards the sun) and into autumn. How can vernal equinox possibly be in March when in Virgo? ------------------------ Yahoo! Groups Sponsor --------------------~--> Join modern day disciples reach the disfigured and poor with hope and healing http://us.click.yahoo.com/lMct6A/Vp3LAA/i1hLAA/UlWolB/TM --------------------------------------------------------------------~-> To subscribe, send a message to: [EMAIL PROTECTED] Or go to: http://groups.yahoo.com/group/FairfieldLife/ and click 'Join This Group!' Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/FairfieldLife/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
