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I know the moon circles the earth every 29.5 days, and that it has an eliptical orbit, but how can I find out where it will be? Does it follow the equator in its orbit? The sun has a solstice as the axis of the earth changes over a year but does the moon have a solstice too?
Is the information in here http://en.wikipedia.org/wiki/Moon ? And Here http://en.wikipedia.org/wiki/Ecliptic#Ecliptic_and_Moon ? Last edited by max8166; 17-August-2006 at 11:05 AM. |
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When teaching the night sky, I sit a kid in a chair, facing ~ South, and have them follow the sweep of a laser pointer across the wall...motion of the sun. Successive sweeps rise slightly from Dec.21-June 21...drop slightly from June 21-Dec.21 If you pay attention to the daily sweeps, you should find the moon ~there at night, and the planets, too. You can naked eye see Mercury, Venus, Mars, Jupiter, Saturn (Earth)....This is the simplified version. Pete
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A third rate theory forbids A second rate theory explains after the fact A first rate theory predicts...A. Lomonosov |
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| trinitree88 |
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This message has been deleted by Tinaa.
Reason: by poster request
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This website should help you find what your looking for!
http://www.fourmilab.ch/yoursky/ |
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The moon's orbit is inclined by about 5 degrees relative to the ecliptic plane. (The ecliptic plane follows the zodiacal band in the sky that trinitree88 described above.) The orbit twists around slowly in the ecliptic plane, maintaining a more or less constant tilt.
Within its orbital plane, the moon moves closer to the Earth (perigee) and farther from the Earth (apogee) at either end of its orbital ellipse. These points also migrate continuously around the orbital plane. So its position in the sky is difficult to predict without some maths, and impossible to predict accurately without a lot of maths. Websites or astronomy software are by far the easiest ways to find the moon's position. Grant Hutchison |
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Oh this is good, this is just what I was looking for thanks
http://www.fourmilab.ch/earthview/moon_ap_per.html |
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From: http://www.astro.wisc.edu/~dolan/con...ra/Zodiac.html
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How many times have you been about to grasp the truth when somebody else suddenly yanked it out of your reach? |
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Grant Hutchison |
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It actually circles the earth in a little over 27 days--so that it goes through the cycle of constellations in those 27 days.
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Revolution period(Sidereal period)=27.32166155 days (27 d 7 h 43.2 min) and on the other: Synodic period = 29.530 588 days (29 d 12 h 44.0 min) Any explaination would be gratefully received |
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Similarly, the earth rotates in 23h 56m--it takes an additional 4 minutes to "catch up". If you add up those four minutes per day, over the entire year, you find that there is an additional day/rotation that is "lost" because of the revolution about the sun. Those extra couple days in the case of the moon add up to one full "lost" revolution. |
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So to position the moon in the longitudinal sense, in other words ignoring the latitude. Can I say that for every earth day (24 hours) the moon moves about 13.179 degrees ** in the sky? (just in the longitude plane)
** 360/27.32166155 |
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1) Because the moon has an elliptical orbit, it moves alternately faster and slower across the sky. 2) When the moon is far from the celestial equator, it will cross more lines of celestial longitude for a given angular movement than it does when it's near the equator: the lines of longitude are closer together (as they converge towards the pole), and the moon is moving more nearly orthogonal to them. Grant Hutchison |
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13.179 degrees, I meant just as an approximation, how many degrees would I be out by in the worst case? I was only trying to approximate. Also as the moon crosses the Ecliptic twice an orbit or is it twice a month, can you approximate the Latitude by making it equal to the latitude of the sun (plus or minus 5 degrees)
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.I don't know the size of the error, and of course the calculations to determine that are almost as complicated as the calculations to get an exact position for the moon. But I'd guess on the order of a few degrees. Quote:
Grant Hutchison |
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The moon is October and November is very low in the northern sky. So low that from Europe or Canada, it never completely achieves whiteness. The full moon at its height is still somewhat orange.
Or so I've heard. I've never had the chance to see the Hunter or Harvest Moon from that far north.
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My astronomy software says that on Nov. 5, 2006, at 23h UT, from Paris, the moon will be at a height of 57 degrees. |
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Taking a step back and looking at it another way, can I locate the moon if I know where the Ecliptic Plane is and then locate the moon on this plane preceding the sun by an approx cumulative 13.178 degrees per day, with a 5 degree oscilation about the ecliptic (with an oscilation period of half a rotation)?
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