Page 1 of 2 12 LastLast
Results 1 to 10 of 16
  1. #1
    m's Avatar
    m Guest

    Default Why are there 360º in a circle?



    Hello!,
    I know this is probably a silly question for you,
    but why are there 360º in a circle?, has it anything
    to do with astronomy?

    Thanks,

    Mixi


  2. #2
    SteveTBM®'s Avatar
    SteveTBM® Guest

    Default Why are there 360º in a circle?

    "m" <mixi.mo@virgin.net> wrote in message
    news:1151943578.344229.101770@m79g2000cwm.googlegr oups.com...
    Hello!,
    I know this is probably a silly question for you,
    but why are there 360º in a circle?, has it anything
    to do with astronomy?

    Thanks,

    Mixi



    It is said to be an approximation of the number of days in the year (a
    circle being one cycle of the seasons or one year)

    SteveTBM



  3. #3
    Norbert's Avatar
    Norbert Guest

    Default Why are there 360º in a circle?

    m nous a donc écrit :

    I suppose that it's coming from the old epoch of Sumer, where they used to
    calculate with a base 60, instead of 10 like us.

    --
    Norbert. (no X for the answer)
    ======================================
    knowing the universe - stellar and galaxies evolution
    http://nrumiano.free.fr
    images of the sky http://images.ciel.free.fr
    ======================================



  4. #4
    m's Avatar
    m Guest

    Default Why are there 360º in a circle?

    SteveTBM® wrote:-


    Norbert wrote:-


    Thank You !, I thought so, but had to check it to make sure!

    mixi.mo


  5. #5
    mike's Avatar
    mike Guest

    Default Why are there 360º in a circle?

    "m" <mixi.mo@virgin.net> wrote in
    news:1151946133.998166.68700@v61g2000cwv.googlegro ups.com:

    Which raises (not "begs"; meejah types please note) the question;

    why did they divide it into 6? If they did, of course, but starting from a
    base 60 it seems logical.

    This may be an old wives tale, but I was told it's counting on fingers -
    the thumb of one hand ticks off each finger joint to give 12, and the other
    fingers tally to 5 to give a count of 60. Well, at least you don't have to
    take your socks off

    mike


  6. #6
    Norbert's Avatar
    Norbert Guest

    Default Why are there 360º in a circle?

    mike nous a donc écrit :


    In fact, it seems that Sumerian people used a complex system based upon 60,
    10 and 6. If you want to perform calculations only with a base 60, you must
    have 60 names for the "digits". So, to simplify a bit, they also used base
    10 and base 6.

    --
    Norbert. (no X for the answer)
    ======================================
    knowing the universe - stellar and galaxies evolution
    http://nrumiano.free.fr
    images of the sky http://images.ciel.free.fr
    ======================================



  7. #7
    Mark McIntyre's Avatar
    Mark McIntyre Guest

    Default Why are there 360º in a circle?

    On 3 Jul 2006 17:53:16 GMT, in uk.sci.astronomy , mike
    <mike.ring@btinternet.com> wrote:


    You can count to six with one hand.


    Nope.
    --
    Mark McIntyre

  8. #8
    tudor's Avatar
    tudor Guest

    Default Why are there 360º in a circle?


    m wrote:

    I believe that it is tied in to the sidereal day.

    Please go to my web site at www.storm.ca/~tjones/sidereal.html for my
    views.

    It is a short article and will only tyake a couple of minutes to read.

    Thanks,
    Tudor.


  9. #9
    Weatherlawyer's Avatar
    Weatherlawyer Guest

    Default Why are there 360º in a circle?


    tudor wrote:


    Since we are talking about opinions (and that is all they can be) here
    is mine:

    When Noah was counting off the weeks and months, he got thirty days for
    each. I can't remember how to work it out but it's in the narrative at
    Genesis 7 vss 24 and etc., "And the waters continued overwhelming the
    earth a hundred and fifty days."

    Obviously they had some idea of constellations in those days. Three
    hundred and sixty is a better number to juggle with if you have no
    computer than the use of decimals. Bear in mind that the shorthand for
    circumscribing a circle or hemisphere is 60 degrees = the radius. (More
    accurately than the use of pi.)

    But why call the angle 60 rather than 50 or 10?

    Suppose we used a ten day week and a three week month or whatever.
    There are a number of ways thing could have gone. The Germans used a
    400 degree circle in WW 2. It never caught on. Perhaps because more
    number divide fairly well into 360 for the purposes of astrology (as
    astronomy was known in those days?)

    Decimal systems were not unknown. 10 was seen as completeness yet 6 was
    considered a perfect number for men. The law of thirds and sixes
    applies throughout the geometry of architecture and seems to have
    always done so.

    There would be a zero in that system as in no sheep one sheep two
    sheeps three sheeps etc. But there is no zero on the circumfrence odf a
    circle.

    (Perhaps someone could help me out here?

    What year is this one:
    http://sunearth.gsfc.nasa.gov/eclips...ases-0099.html
    (Bottom of the page.)

    Year New Moon First Quarter Full Moon Last
    Quarter Delta T


    0
    Jan 3 07:42 Jan 9 23:04 t Jan
    17 05:48 02h56m
    Jan 25 09:45 Feb 1 16:17 Feb 8 10:56 Feb 16
    01:53
    Feb 24 00:26 Mar 1 23:00 Mar 8 23:15 Mar 16
    21:36
    Mar 24 11:47 Mar 31 05:03 Apr 7 12:15 Apr 15
    15:24
    Apr 22 20:30 Apr 29 11:35 May 7 02:12 May 15
    06:15
    May 22 03:44 May 28 19:35 Jun 5 17:08 Jun 13
    17:57
    Jun 20 10:34 P Jun 27 05:58 Jul 5 08:35 t Jul 13
    02:59
    Jul 19 17:57 P Jul 26 19:29 Aug 3 23:47 Aug 11
    10:18
    Aug 18 02:43 Aug 25 12:27 Sep 2 14:05 Sep 9
    16:58
    Sep 16 13:35 Sep 24 08:19 Oct 2 03:17 Oct 9
    00:02
    Oct 16 03:15 Oct 24 05:27 Oct 31 15:38 Nov 7
    08:27
    Nov 14 20:01 Nov 23 01:40 Nov 30 03:23 Dec 6
    19:00
    Dec 14 15:10 A Dec 22 19:10 Dec 29 14:34 p

    And what is Delta T and the other letters: "A" "P" and "p" etc?

    And what is this 02h 56m ?)


  10. #10
    Peter Sheppard's Avatar
    Peter Sheppard Guest

    Default Why are there 360º in a circle?

    > You can count to six with one hand.

    Clever people can count as far as 31 on one hand ;-)



 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Help: Slipping RA circle on EQ3-2
    By Mark Robertson in forum UK Astronomy Forum
    Replies: 5
    Last Post: 11-11-2011, 04:54 PM
  2. DEC Setting circle is off?
    By RhetoricCamel in forum Astronomy Beginners Forum
    Replies: 3
    Last Post: 01-30-2011, 07:07 PM
  3. RA Circle
    By -TK- in forum ATM DIY Telescope Making Forum
    Replies: 2
    Last Post: 04-18-2010, 01:15 PM
  4. How to use RA Setting Circle
    By Serge933 in forum Telescope Mounts Forum
    Replies: 10
    Last Post: 04-06-2009, 11:24 PM
  5. Help: Slipping RA circle on EQ3-2
    By Mark Robertson in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 09-11-2004, 06:34 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 09:18 AM.