lunar trip

Please, do your own homework.

Well one month is one rotation of the moon around the earth (lunar month not calender month) so I would suspect that one formula that any basic engineer knows that relates to radius and circumference would get close enough.

Too bad there is not a web site that searches for things that can help a person find out stuff like this being they apparently don't teach it in high school or college any more.

Regards

>> (lunar month not calender month) <<

It is a month of Lnar-calender used by Muslms of the world and I think the very 1st to count months. as solar calender was quite ately thought of.

Haajee,

The lunar calendar works by visibly sighting the slight crescent moon that marks the beginning of each month. That is the synodic month of about 29.53 days. That is a longer period than the completion of a lunar orbit.

The sidereal month is the time it takes for the moon to make one complete orbit with respect to the fixed stars, which is about 27.32 days.

How would the lunar calendar work above the Arctic circle where there are long periods when the moon is not seen and the sun shines for 24 hours during summer?

Jon

Regards.

Yes to << The lunar calendar works by visibly sighting the slight crescent moon that marks the beginning of each month >> to some extent that all Occassion in Islam are celebrated locally by most of the Muslim countries, but the Hajj is only celebratd in Makkah, Saudi Arabia because this is the only place where it can be. It is an obligation to all Muslims once in lifetime if he/ she can afford its expences, an example set by Abraham [Be peace of God upon him] the messanger of God the Almighty.

Islam set it as an obligation.

A fact about the Lunar-Trip:

Astronomy has a term Birth of moon; that is if the Moon is set after the suset the change of Lunar Month is considered in some countries as their Official Calendar is the Lunar-Caledar [named as Islamic Calendar by Wikipedia]. But the Hajj is celebrated in Makkah, nowhere else.

Thanks for your

Haji,

We are getting quite an education from you.

I have water from Zamzam upstairs.

Jon

Thanks

So you want to know the distance in Kilometers that the Moon travels in orbit around the Earth in a Month.

This may be answered on Wikipedia, or on the NASA site, if you phrase the question correctly.

Wikipedia is terrific partly because you could pick a language to ask the question in, other than English.

You could actually ask first what the distance is from the Earth to the Moon? Then you could calculated your answer from knowing the time from start point of Full to wan and then to Full again as the defining time of the orbit.

If the moon was one hundred Kilometers from the earth, and in thirty days it completed an orbit of the earth, then it will have traveled 3000 kilometers per 30 day month, for instance.

I'm really really terrible at math, so I could be wrong.

The answer to your question depends largely on the frame of reference you want to use. It takes 27.3 days for the moon to orbit the earth but if you incorporate the earth's position with relation to the sun, the moon takes 29.5 days to orbit, since that is the period of the phases of the moon.

How far does the moon travel during one month? Well, once again, are you measuring ground speed? The earth rotates underneath the moon every 24 hours, so call it 1.2 million km. Or perhaps you are presuming that the earth is stationary and the rest of the universe is ignored? That would give you a figure of around 2.6 million km. You might also observe that in one month the earth itself travels 1/12 of its billion km orbit around the sun, a distance not to be ignored. But then, in that brief month, the sun travels a pretty fair distance around the center of the Milky Way galaxy; at approximately 250 km per second, that slight wobble in the moon's path through space because of its around the earth is negligible. Then if you add in the speed at which the Milky Way galaxy is moving (estimates from 130-600 km/sec) all bets are off.

Of course at speeds like that you might have to start considering time compression due to special relativity...

Did you think you had a simple question?

Bravo for recognizing that this homework problem lacks enough definition to give one simple answer. You get a GA from me. Possibly this student couldn't quite put his finger on the ambiguity of the question.

thank you Mitsurati and all the rest,

as i posted the question as much simple as i could , then i was expecting a simple answer as well .

so i want to presume that the earth is stationary and the rest of the universe is ignored , so how did u get that value of 2.6 million km ???

regards

It's just the length of the Moon's elliptical path around the Earth.

excactly

amerlathgani,

One month is anything from 29 to 31 days.

I will use one lunar month.

Knowing that the average centre-to-centre distance, or radius, from the Earth to the Moon is 384,403 km and thus the diameter is 768,806km.

And the orbit, or circumference is figured by C=∏D C = ∏ 768,806km then the orbit, or circimference = 2,415,275.3 km.

The Moon makes a complete orbit around the Earth every 27.3 days. That is the 360 degree orbital period.

The phases of the moon, which repeat every 29.5 days is the synodic period.

Jon

Regards.

>> One month is anything from 29 to 31 days. <<

One month is anything from 29 to 30 days.

With a sequense of : No 3 consective months be of 29 or 30 days

Lunar year is approx 355 days. S each year the lunar year starts 10 days earlier to the previous one.

As << phases of the moon, which repeat every 29.5 days is the synodic period >>

Hajee,

I lied.

February has 28 days for 3 years then 29 except in correction years.

The moon doesn't give a rip how we count our days months and years.

I put the extra junk in there to see if a "fish" would bite.

You said: "One month is anything from 29 to 30 days." What calendar is that?

7 Calendar months have 31 days so the truth is: A calendar month can be 28 to 31 days.

And you said: "each year the lunar year starts 10 days earlier to the previous one."

Is that true year, after year, after year or is there an occasional year with more or less than 10 days start time?

Do you supposed the OP now knows how long the orbit of the moon is now?

Jon

Regards.

My dear kudukdweller9

You have mixed up the Solr-Year [used the world over & known mostly as 'Gregorian-Calendar'.

Of course it has 28, [29 in leap year], 30 & 31 days months & a year of 365 days & 366 days in a leap year.

There are many other caledars; like Bikrami [used by Hindus in Bhaarat] & more.

Most of those are exactly hve & in sync with 'Gregorian-Calendar' ie have as many days to a year as the 'Gregorian-Calendar' has but start at different time of 'Gregorian-Calendar' year. Like Bikrami starts on 14th of April. And Julian has recetly synchronised with Gregorian caledar. Mostly used in Europe.

I am talking about the 'Lunar-year' known as 'Hijree-Calendar'

Its months are counted by the Site of Moon. As the moon is sited [or Birth of moon is] the new month starts.

As it has 29 / 30 days months & the lunar-caledar as I said cannot has 3 consective months having either 30 or 29 days so it has approx 10 days less than the Solar-year.

And all the Calendars used in this world have 12 months in a year.

The 1st month is named 'Muharram' in Hijre-Calendar'. It does not fall always on a particular date of 'Gregorian-Calendar' and cannot due less number of days [-10]

so it will start 10 days earlier.

I hope my point of view will be clear.

If you have access to American Heritage Dictionary it has a good review of Calendars; 'Gregorian-Calendar' , Hijri & Hebrew Calendars.

Sorry I am away from my home otherwise I like to attach a scanned copy of it.

Any how have alook on:

Calendars of the World

Have a fine Day of all Calendars !!!!

Haajee,

The Badi Calendar has 19 months per year with 4 or 5 intercalary days to compensate for anomalies. Was that in your calendar collection? Does the moon perform according to the diverse calendars or does it ignore them and the people who dreamed them up?

How would the lunar calendar work above the Arctic circle where there are long periods when the moon is not seen and the sun shines for 24 hours during summer?

The moon doesn't give a rip how we count our days months and years.

I put the extra junk in there to see if a "fish" would bite. Are you the "FISH"?

Do you suppose the OP now knows how long the orbit of the moon is?

Jon

To all ... thanks to Haajee and Kud for the enlightenment regarding calendars of the world...! When I first read the OP, I expected intricate mathematics to dominate the discussion, here. Amazing , what surprises sometimes await us.

Rather confounding that amerlathqani hasn't jumped back in, to provide further clarification regarding the extent/precision desired out of this discussion...(?)

Having refreshed my failing recollections of Newton, recently (particularly regarding the interesting relationship between the areas of triangles describing any particular duration of orbit of any of the planets; i.e., a triangle drawn covering 1 week at its apogee contains the same area as a triangle drawn covering 1 week at its perigee)...

...I can't help but wonder whether there is a definite/distinct relationship; similar, but different ... with respect to our moon's orbit around the earth when the earth is at ITS apogee from the sun vs when it is at its perigee from the sun ... and whether THIS is of concern-to the OP...?

How about it, amerlathqani ? "Cheers"!

ndt-tom,

I wonder what happened to amerlathqani.

Signing up for a trip to the moon?

Jon

Regards.

This point I have brought in notce of all in a post that the Originator should read all replies and should acknowlodge.

Regards.

Thanks for informative reply. I will look in details more in calendars.

When I was [some 15 years back] intrested to have a deep view of the ''CALENDAR''

[I recall when the New Millium was to come] some people had the idea that the year 2000 will have the Feb of 30 days & I have confidense that it will be of 29 days as we in PAKISTAN had this topic in our syllabus [Maths] & a Rule we learned about the ''LEAP YEAR'' was:

1. in normal years it will be of 29 day if the year can be divided by 4 &

2. A cetury-Year only be of 29 days if the Cetury year can be divide by 400 &

3. it cannot be of more than 29 days in any case.

I bet on this RULE & won.

Secondly there a false concept of the 3rd millennium to be from the year 2000.

I had a firm concep that the year 2000 was the last year of 2nd millennium & 3rd

millennium will start from the day 1st Jan' 2001, & my collegues also bet on this & lost.

You may remember that it was celebrated by USA & Bush, the president then, also tok part in that occassion & regretted in words I remember '' we will also celebrate in year 2001'' or having the same sense.

May I also tell you that ''Year-2000-bug'' was also the Hottest topic of ITs & PATCHes for were on the climax. Import of IT people was the most urgent jobs in the world.

But only one man on NET, I can't recall his name, was of the view that nothing will will happen & all the PCs will go to new dates without any problem.

I remember that the Orgs expected to be effected were claiming before puclic that they had fixed the bug; only bullshitting. Telephone Department in PAKISTAN kept their system closed from 23:55 to early morning. This I knew due to that I got some emergency to talk to my son in USA but the system was dead. I have the urgent message for my son & kept on monitoring the whole niht & got through in the morning.

I obeyed the man & have atry to advance the date on my PC to 31st Dec 1999 , 21:55 & waited for the worst to happen.

It was an enjoyment for me whn it changed the date without any thing to happen.

I explored the net for all the information I could obtained & saved on my HDD; but unfortunate I had no accessed to a CD Writer. And lost due to the bad drive.

Any how I like to put on record some pints I remember:

1. Jullian Calendar was in use till some year of 17th or 18th century; ie in all years including century-year Feb will be of 29 days if the year can be divided by 4.

2. With research of Gregorian it was decide to ammend it THAT the century year only be of 29 days if it can be divided by 400, which had the following effects:

a. The century years [ eg 1800 & 1900 were not leap years] to get more accuracy.

As in Julian it was considered that full rotation of Earh around the Sun in 365 + 6hrs or 365 & 1/4 days so by adding 1 day every 4th year will bring the **** position of Sun back.

**** = the exact term I don't remeber, it is the time of when the SUN is in top on the head in heavens postion on 21s sep' [this date I am not sure]

b. This caLculation was confirmed by th authorities of the time in some 1737 [] but was acted upon some years late in Sep; that Sep was of 20 days to coincide the date & the position **** of Sun.

Now 1 fact about Hebrew Caledar:

A year is of 12 months of 30 days and after 30 years [I guess] a month is added with a name I don't rember & it becomes of 13 months of 30 days year.

Sorry I have taken too much time of all.

Have a fine day !!!!! U & All.

Regards.

I don't mind whatever you have noted as I have to consult a dictionery to understand, but how the Solar-caledar at the Poles.

How the days & dates are changed there?

I think it is with the nearest populated areas' days 7 dates.

The same may be true for the Lunar-Calendar users. I have no knoledge.

Have a fine day even if you are at Arctic circle or Antarctic circle or even just on the Poles !!!!!

Reards.

About Badi Calendar >>

It was created :

Baha'i calendar, whose origins date back to the ministry of the Bab (1844-1853),

as the link says.

But from the known history of the world all calendars have only 12 months.

Baha'i calendar is an artificial calendar in my view.

I remember that one of the ex-russian states try to or made the year of 10 months to deprive the workers of 2 months benefits ???

And how others have done God knows better.

I don't know what is in Bible or Old Testaments, but Qura'an says:

***************************************

Surah At-Tauba Ruku 5 Ayah 36 Qura'an

Translations By:

　Yusuf Ali

The number of months in the sight of Allah is twelve (in a year) so ordained by Him the day He created the heavens and the earth; of them four are sacred; that is the straight usage. So wrong not yourselves therein and fight the pagans all together as they fight you all together.

But know that Allah is with those who restrain themselves.

&

Pickthall

Lo! the number of the months with Allah is twelve months by Allah's ordinance in the day that

He created the heavens and the earth. Four of them are sacred: that is the right religion.

So wrong not yourselves in them. And wage war on all the idolaters as they are waging war on all of you.

And know that Allah is with those who keep their duty (unto Him).

　***********************

And about Israil [Jacob's# Family]

# Be peace of Allah upon him

Israel had twelve sons (Gen. xxxv. 22-26),

------------

We divided them into twelve tribes, .....

20:160 Qura'an

---------

"Kudos", kud ~

I tend to agree with John (Post 2) that this wasn't a homework question, and deserved a civil response...

and from that infernal For-what-it's-worth department ... (to those who repetitively "shove" posters to wiki-or-wherever) ... the hyperlink tool exists for good reason:

Wiki's "Orbit of the Earth's Moon" page

NASA.gov figures pertaining to the moon {2 different links)

Works great, saves time and frustration for a buncha-people all at once ... and says you care.....

Blessings to all ~

[ couldn't help but jump-in ... someone else posted in a "Tolerances" thread the comment that "we went to the moon using slide rules". My dad was a mathematician who imparted much appreciation upon me. Fresh outta college, he was selected as part of a team to work at Point Mugu, CA (for the Navy) using sextants etc to determine just how accurate we might expect to be, IF we were to build a sub that could fire missiles a given distance... Turns out they were pretty darned close!... though long-since 'eclipsed'...]

Just in case it matters, the circumference of an ellipse is not quite as simple as ∏D. That's close enough for thought experiments, but if someone wants to get an exact measurement some calculus is required...like for example if someone is doing homework or planning to put a satellite in orbit.

Mitsurati,

True, but the person who asked would not have wasted time here asking such an unchallenging question if that were the case. The average was good enough for taking the ride on the moon. Getting there did not seem to be part of the question.

Jon

Agreed.

Regards

A link for conversion & information about different Main caledars of the world

i must mention that it's a lunar month , that was my mistake .......

sorry everybody

Amerlathqani,

Do you remember this?

Knowing that the average centre-to-centre distance, or radius, from the Earth to the Moon is 384,403 km and thus the diameter is 768,806km.

And the orbit, or circumference is figured by C=∏D C = ∏ 768,806km then the orbit, or circimference = 2,415,275.3 km.

The Moon makes a complete orbit around the Earth every 27.3 days. That is the 360 degree orbital period.

You can figure out the speed from this and get the distance for the synodic period - the phases of the moon, which repeat every 29.5 days.

Jon

Call up the astronomy people at CALTECH. I used to work there and do not remember the phone number sorry.