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Offlineentiformatie
EvolutionaryMovements
Male
Registered: 03/06/03
Posts: 1,043
Loc: miami, florida
Last seen: 8 years, 24 days
full moons?
    #3156145 - 09/20/04 04:18 PM (12 years, 2 months ago)

So I was looking for the next full moon, because we have drum circles every full moon, and I found that the full moon of september is the 28th, and then it's the 28th in october as well. That's 30 days. The phase of a moon is supposed to be 28 days. I checked a calendar that goes back like 10 years, and apparently that's not uncommon. What gives?


--------------------
/opinion
.sean


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Invisibleadrug

Registered: 02/04/03
Posts: 15,800
Re: full moons? [Re: entiformatie]
    #3156318 - 09/20/04 04:46 PM (12 years, 2 months ago)

I think its just an estimate.

http://scienceworld.wolfram.com/astronomy/Moon.html

Quote:

The exact value is 29.530589 days, or 29 days, 12 hours, 44 minutes, 3 seconds. However, there is a great deal of variation in the actual time for a given lunation (the time between two successive new moons).




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OfflineSeussA
Error: divide byzero

Folding@home Statistics
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 22 days, 16 hours
Re: full moons? [Re: entiformatie]
    #3156325 - 09/20/04 04:47 PM (12 years, 2 months ago)

The average time between full moons is around 29.5 days. Angular changes between orbits cause the time between full moons to change... Lemme look real quick for a good explaination...

http://aa.usno.navy.mil/faq/docs/moon_phases.html

Quote:

The phases of the Moon are related to (actually, caused by) the relative positions of the Moon and Sun in the sky. For example, New Moon occurs when the Sun and Moon are quite close together in the sky. Full Moon occurs when the Sun and Moon are at nearly opposite positions in the sky - which is why a Full Moon rises about the time of sunset, and sets about the time of sunrise, for most places on Earth. First and Last Quarters occur when the Sun and Moon are about 90 degrees apart in the sky. In fact, the two "half Moon" phases are called First Quarter and Last Quarter because they occur when the Moon is, respectively, one- and three-quarters of the way around the sky (i.e., along its orbit) from New Moon.

The relationship of the Moon's phase to its angular distance in the sky from the Sun allows us to establish very exact definitions of when the primary phases occur, independent of how they appear. Technically, the phases New Moon, First Quarter, Full Moon, and Last Quarter are defined to occur when the excess of the apparent ecliptic (celestial) longitude of the Moon over that of the Sun is 0, 90, 180, and 270 degrees, respectively. These definitions are used when the dates and times of the phases are computed for almanacs, calendars, etc. Because the difference between the ecliptic longitudes of the Moon and Sun is a monotonically and rapidly increasing quantity, the dates and times of the phases of the Moon computed this way are instantaneous and well defined.




--------------------
Just another spore in the wind.


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Invisibleadrug

Registered: 02/04/03
Posts: 15,800
Re: full moons? [Re: Seuss]
    #3156349 - 09/20/04 04:50 PM (12 years, 2 months ago)

HA, I beat you. :smile:


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Offlineentiformatie
EvolutionaryMovements
Male
Registered: 03/06/03
Posts: 1,043
Loc: miami, florida
Last seen: 8 years, 24 days
Re: full moons? [Re: adrug]
    #3156729 - 09/20/04 06:19 PM (12 years, 2 months ago)

thanks to both of you :-) i wonder why i was told 28 days tho... i thought it was like common knowledge or something. oh well, cool stuff, that astronomy science stuff is.


--------------------
/opinion
.sean


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