Author Topic: Moon as a Compass  (Read 3405 times)

MoonMan

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Moon as a Compass
« on: September 15, 2013, 08:21:41 AM »
The Moon, by its Face one knows its Direction

The Moon rises in the East & sets in the West,
 moving through North if one be south of the Tropic of Capricorn, seeming to roll clockwise;
 & moving through South if one be north of the Tropic of Cancer, seeming to roll anticlockwise.

"Let the Part nearest the Horizon have the same Azimuth as the Horizon"_ Cassini
 
Keeping Track of where Here is in relation to There.

Callum

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Re: Moon as a Compass
« Reply #1 on: September 15, 2013, 09:10:50 AM »
Is the Moon’s rising east subject to the same variation of amplitude as the Sun i.e. 23.5° north or south?

MoonMan

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Re: Moon as a Compass
« Reply #2 on: September 15, 2013, 10:49:20 PM »
Moon's Inclination to Ecliptic is 5.14 degrees,so, at Minor Standstill,18.3 degrees;at Major Standstill, 28.57, over a period of 18.63 years. last Major was June 2005, next Minor is October 2015.
Sine Amplitude equals cosine Azimuth equals sine Declination secant Latitude
« Last Edit: September 15, 2013, 11:28:39 PM by MoonMan »
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captain paranoia

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Re: Moon as a Compass
« Reply #3 on: September 16, 2013, 06:24:22 PM »
> The Moon rises in the East & sets in the West,
> moving through North if one be south of the Tropic of Capricorn, seeming to roll clockwise;
> & moving through South if one be north of the Tropic of Cancer, seeming to roll anticlockwise.

I guess that means that, if you're in the tropics (between Capricorn and Cancer), the moon doesn't roll either way?

> moving through North

I assume that's the Moon 'moving through North', although I'm not entirely sure what this phrase means.

Given the somewhat 'Pirate Talk'* nature of this expression, I take it it has a nautical origin...? 

* "Yaaarr, me hearties, if ye be south of the tropic of Capricorn, beware of the fearsome, ship-eating snaggerwrat..."

MoonMan

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Re: Moon as a Compass
« Reply #4 on: September 17, 2013, 07:41:34 AM »
 In the Tropics: the Moon, by Declination, can be either North or South of the Observer's Latitude; if it be North, East is on the Observer's Right; if it be South, East is one the Observer's Left.
Moving through North means it will move through the sky that is North of the Observer, whose back will be towards the near Pole, except in the Tropics,where both options are possible during any given month. of course, if one's Latitude is the same as the Moon's Declination,on that day, the Moon {or the Sun,for that matter} will seem to travel directly from east to West, with no shadows cast when overhead. The Eastern part will remain in the east until the Western part take over. see p 78 in the Book: the Moon is NE
« Last Edit: September 22, 2013, 01:21:01 AM by MoonMan »
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MoonMan

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Re: Moon as a Compass
« Reply #5 on: January 23, 2014, 05:22:08 PM »
<a href="http://www.youtube.com/watch?v=1csYhGc3B8w" target="_blank">http://www.youtube.com/watch?v=1csYhGc3B8w</a>  Moon as Compass
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Pete McK

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Re: Moon as a Compass
« Reply #6 on: January 24, 2014, 01:14:51 PM »
Moonman, this sounds really interesting but I have not quite grasped it yet. How do you translate the bearing you see on the moon to your bearing on the earth please, because the moon moves across the night sky I would not know which way I was facing.

MoonMan

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Re: Moon as a Compass
« Reply #7 on: January 27, 2014, 03:45:12 AM »
Moonman, this sounds really interesting but I have not quite grasped it yet. How do you translate the bearing you see on the moon to your bearing on the earth please, because the moon moves across the night sky I would not know which way I was facing.
 
The Moon, by its Face one knows its Direction



The Moon rises in the East & sets in the West,
 moving through North if one be south of the Tropic of Capricorn, seeming to roll
clockwise;
 & moving through South if one be north of the Tropic of Cancer, seeming to roll anticlockwise.

"Let the Part nearest the Horizon have the same Azimuth as the Horizon"_ Cassini
 

Now, you have a whole month to observe coming up. That should see you right.
« Last Edit: April 05, 2014, 05:43:14 AM by MoonMan »
Keeping Track of where Here is in relation to There.

MoonMan

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« Last Edit: April 19, 2014, 09:36:50 AM by MoonMan »
Keeping Track of where Here is in relation to There.