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Lunie Tracker. What kind of Path traceth The Moon?

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#1 TheResisting

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Posted 09 April 2013 - 01:27 PM

Hi, never mention lunie when you want me to be serious.
My Question is though, viz; - what kind of a path does the moon make across our heavens, as actually observed, rather than (¿)Lunar_physically?.
To summarise; - (You know, sunrise, the one early in the morning?!):

In order to accurately track our Moon, would I need a Polar, or an AZ/EL mount?
- Or is there something else to all this that I have no idea of ...?

Answers on a postcard to here ...

Gram :praying:

#2 brianb11213

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Posted 09 April 2013 - 02:07 PM

Well, the Moon's motion is pretty darned complicated, what with the earth's axial tilt, the tilt of the Moon's orbit with respect to the earth's equator, the eccentricity of the Moon's orbit and the change in the longitude of the ascending node of the Moon's orbit ... but in practice an equatorial mount running 3.66% slow with respect to sidereal tracking speed, or a computerized altaz mount set to lunar tracking rate (which amounts to pretty much the same thing) does a reasonable job of tracking the Moon: there is still some drift both in RA and in Dec but these are slow enough to be ignored for (almost all) practical purposes.

#3 TheResisting

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Posted 09 April 2013 - 02:28 PM


Thanks friend. I thought there might be more to it. I've gotten hold of a controller that's POLAR but which can be changed to AZ/EL with a software/firmware tweak or three.
I'll do some research.

Thanks.

#4 Centaur

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Posted 10 April 2013 - 11:42 AM

The Moon’s orbital plane intersects the ecliptic (Earth’s orbital plane) at about 5°. During a cycle of 18.6 years the nodes (points of intersection) precess through 360° of ecliptical longitude. On my Moon webpage I display a chart of the monthly path of the Moon: www.CurtRenz.com/moon

#5 TheResisting

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Posted 13 April 2013 - 03:17 PM

Thanks Curt. I'll bookmark the page.






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