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Thread: milky way

  1. #1
    Dan Moos's Avatar
    Dan Moos Guest

    Default milky way



    is th milkyway visible year round? I can't see it from my backyard, but
    imagine there is some light pollution at play

    I live in NW washington state, if it matters.



  2. #2
    Hilton Evans's Avatar
    Hilton Evans Guest

    Default milky way

    "Dan Moos" <dan.moos@verizon.net> wrote in message news:_7Aie.365$6d.52@trnddc08...
    Essentially, yes, if you define visible as being
    above the horizon after astronomical twilight.
    Just for fun I used the freeware app NightVision
    to look at the night sky for each month after 10PM or
    as early as 8PM in mid winter. The same can be done with
    monthly sky charts or a planisphere. The Milky Way was
    visible each month albeit sometimes quite low in the
    sky during convenient hours
    --

    Hilton Evans
    ---------------------------------------------------------------
    Lon -71° 04' 35.3"
    Lat +42° 11' 06.7"
    ---------------------------------------------------------------
    Webcam Astroimaging
    http://home.earthlink.net/~hiltoneva...troimaging.htm
    ---------------------------------------------------------------
    ChemPen Chemical Structure Software
    http://www.chempensoftware.com


  3. #3
    William Hamblen's Avatar
    William Hamblen Guest

    Default milky way

    On 2005-05-18, Dan Moos <dan.moos@verizon.net> wrote:

    This time of year the Milky Way is close to the horizon in the evening.
    Now the waxing gibbous Moon is up and moonlight washes out the Milky Way.


  4. #4
    geraldkelleher@hotmail.com's Avatar
    geraldkelleher@hotmail.com Guest

    Default milky way

    To Dan

    You are IN the Milky Way and paticipate in its motion,no offense but
    whatever attraction there is to swapping and taking celestial images
    there is nothing quite like encountering these magnificent motions
    directly.

    What ever happened to the energy of youth which would never be
    satisfied with being docile observational peeping toms/celestial
    cataloguers.


  5. #5
    laura halliday's Avatar
    laura halliday Guest

    Default milky way

    "Dan Moos" <dan.m...@verizon.net> wrote:



    Short anwser: no.

    Long answer: the northernmost part of the Milky Way, in
    Cassiopeia, is circumpolar from your latitude and is thus
    visible, at least theoretically, year-round.

    The rest isn't. A portion in Centaurus and Carina never
    rises at your latitude.

    What, exactly, were you expecting to see?

    Laura Halliday VE7LDH "Que les nuages soient notre
    Grid: CN89mg pied a terre..."
    ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte


  6. #6
    tony_flanders@yahoo.com's Avatar
    tony_flanders@yahoo.com Guest

    Default milky way

    Dan Moos wrote:


    For observers in mid-northern latitudes, for practical
    purposes, the answer is no. Well, assuming the weather
    is clear, the Milky Way will be visible at *some* time
    during any night, but it won't necessarily be when
    you're outside, which is typically during the evening.

    What's curious about that is that if you think about
    it, exactly half the Milky Way is *always* above the
    horizon from any location at any time. The galactic
    plane is a great circle reaching across the sky, the
    horizon is another great circle, and two great circles
    always cut each other precisely in half.

    What does vary is how high the Milky Way gets above the
    horizon and how bright the visible part of the Milky
    Way is. Right now, at the end of astronomical twilight
    at latitude 45N, the highest part of the galactic plane
    is just 20 degrees above the northeastern horizon --
    about as low as it ever gets. You can see it there if
    your site is good and dark, but between atmospheric
    extinction and skyglow, it's going to be tough if you
    live anywhere near a city.

    On winter evenings, the Milky Way is nice and high from
    latitude 45N, but the part that's overhead is the anticenter
    in Taurus and Auriga, which is the faintest stretch of the
    Milky Way. So it's moderately hard to see, although nowhere
    near as hard as it is right now.

    During late summer and early fall evenings, by contrast, the
    dazzling Cygnus star cloud is almost directly over the northern
    U.S., making the Milky Way very easy to see even at many
    suburban sites.

    - Tony Flanders


  7. #7
    canopus56's Avatar
    canopus56 Guest

    Default milky way

    Dan Moos wrote:
    but

    Using an internet usenet search engine like Google, look for the post
    in this newsgroup in the thread:

    "where on Earth do you have to live to see above and below the Plane,
    every night of the year?"

    and my reply dated Oct. 28, 2004 (Canopus56) for a series of animations
    and links that may help you visual which part of the disk of the Milky
    Way disk is visible at various times of the year.

    As to the core of our Milky Way galaxy, it is bounded by the
    constellations Sagittarius on the south local horizon, Scorpius on the
    west, and Ophiuchus to the north.
    http://canopus.physik.uni-potsdam.de/~axm/mwpan_vr.html
    http://www.astropix.com/HTML/D_SUM_S/09_SUM_S.HTM

    What you can see of the Milky Way's galactic core depends on your
    latitude. I suspect you can see part of the above described area of
    the sky and can see part of one side of the core.

    Our solar system is embedded in the Milky Way galactic disk and the
    Earth orbits the Sun at an angle of about 63° to the average plane of
    the Milky Way's galactic disk.
    http://www.anzwers.org/free/universe/galaxy.html
    http://www.anzwers.org/free/universe/5000lys.html

    This makes interpreting the relationship of the night sky to our view
    of various parts of the Milky Way disk confusing and a bit tricky.
    Throughout the year, we can see only a portion of various parts of the
    disk and they present at odd, changing angles.

    In the summer, if you can see any part of the "tail" of Scorpius from
    your location and "lid" of the "teapot" Sagittarius, you are looking at
    or near the galactic core. To see the core, you need to go to a very
    dark sky site, such as one of the many national parks in your area.
    There are ten common Messier objects in this part of the sky.
    http://www.seds.org/Messier/more/m024_image.html

    In the summer, when you see the bright constellation Cygnus in the
    east, you are looking "spinward" down our local galactic Cygnus-Orion
    Arm. (90° galactic longitude).

    In the winter, when you see the bright constellation Orion on the south
    horizon, you are looking 180° opposite the galactic center. (180°
    galactic longitude). The galactic core in Sagitarius is to the north
    horizon, obscured by the bulk of the Earth. Looking to the south
    again, east of Orion, our galactic Cygnus-Orion Arm unwinds in the
    anti-spinward direction.

    In the spring, when you see the constellations Leo and Coma Bernices,
    you are looking "up" out the top of the galactic disk in which our
    solar system is embedded.

    The following link lists the constellations that lie along the plane of
    the Milky Way's galactic disk. Spending a few nights at various times
    throughout the year at a dark sky site and tracing these constellations
    will help you to visual where you are in the Milky Way. At first it is
    difficult, but with some practice, it becomes second nature to orient
    yourself with respect to your view of the galactic disk.

    http://www.ottawa.rasc.ca/observers/an9701p3.html

    - Enjoy Canopus56


  8. #8
    geraldkelleher@hotmail.com's Avatar
    geraldkelleher@hotmail.com Guest

    Default milky way

    To Canopus

    Constellations are illusionary stellar circumpolar images generated by
    the axial rotation and orientation of the Earth subsequently they are
    Not a good means to intuitively grasp not just our position to the
    distant galactic axis but our motion about the galactic axis with the
    rest of the visible stars within the Milky Way.

    Twice a year,at dawn and at dusk on the Equinoxes as the axial
    longitude coordinates (with its almost fixed annual orientation) run
    parallel with the changing orbital orientation and as they align
    briefly at dawn and dusk,the illusion generated by axial rotation
    disappears.For those few moments we look out on the cosmos with eyes
    that see things from purely heliocentric orbital motion not just as a
    fact but as an actual experience.Then we can move on to the greater
    motion of the solar system around the galactic axis.

    Unfortunately contemporaries describe a changing axial orientation to
    the Sun (for climatic seasonal purposes) thereby the real astronomical
    significance of the Equinox is lost and with it the magnificent motion
    of our system in the vast arena of stellar celestial motion which we
    call as a structure - the Milky Way.

    Maybe you wish to defend the constellations rather than individual
    stellar motion about the galactic axis or that you swear blind that
    there is no alignment at dawn and dusk on the Equinox but your 'second
    nature' is burying your reader deeper in either Newtonian
    quasi-geocentricity or relativistic homocentricity.


 

 

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