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© iasoberg.com 2013

Where Is the Solar System

Barycenter    is   a   term   that   is   used   to   describe   the   mass   center   of   2   or   more   celestial   bodies,   i.e. stars   and   planets   and/or   a   planet   and   moon(s).      The   solar   system   barycenter    and   Earth   Moon system barycenter  are described below.

Earth Doesn’t Actually Orbit the Sun?

You   were   taught   that   Earth   and   other   planets   in   our   solar   system   orbit   the   sun,   and   that   our   solar system   orbits   the   center   of   the   Milky   Way.   Did   your   science   teacher   have   it   wrong?   Is   everything you’ve learned about physics and gravity wrong?  The Earth Doesn’t Actually Orbit The Sun? For   all   practical   purposes,   what   you   were   taught   wasn’t   entirely   wrong.   Although   the   Earth   does generally   orbit   the   sun,   in   the   strictest   sense,   it   doesn’t.   The   sun   and   other   planets   each   have   their own   gravity   force   which   interacts   and   pulls   on   one   another.   The   result   of   this   phenomenon   is   that everything   in   an   orbital   system   (like   our   solar   system)   orbits   the   center   of   mass   of   the   system.   This     ‘center   of   mass’   of   the   solar   system   is   called   the   solar   system   barycenter.    The   Earth,   the   sun   and everything else in our solar system orbit this barycenter – not the sun .
Solar System Barycenter Barycenter 101
Solar Barycenter Chart courtesy of R L McNish Calgary Centre of the Royal Astronomical Society of Canada.

Where Is the Solar System Barycenter?

The   diagram   displays   the   motion   of   the   solar   barycenter   with   respect   to   the   center   of   the   sun   (shown   as a   yellow   dotted   line   circle). A   coordinate      system      (x-y   axis   =   white   lines)   is   centered   at   the   center   of   the sun. The First Point of Aries (0 degrees celestial longitude) is at the far right of the horizontal axis. In   a   single   star   system   like   ours,   most   of   the   time   (but   not   always),   the   solar   barycenter   is   located somewhere   within   the   star   (in   our   case,   the   sun)   itself.   However,   most   barycenters   continuously   change as   massive   objects   (like   planets)   orbit   a   star.      If   an   unusual   alignment   happens   where   a   large      percentage of   mass   is   on   one   side   of   the   star,   the      barycenter   can   exist   outside   of   the   star’s   radius.   In   cases   of   2   star systems,   the   barycenter   will   be   located   between   the   two   stars.   If   the   stars   aren’t   of   the   same      mass,   the barycenter   will   be   closer   to   the   heavier,   or   more   massive      one.   So   the   solar      system   barycenter   and   the sun's   location   are   dependent   on   the   motion   of   the   planets   and   other   massive   objects   in   the   solar   system. If   you   want   all   the   gory   detailed   data   re:   the   position   down   to   the   .00000001   of   a   degree   longitude,   you can go here .

Where Is the Earth Moon System Barycenter?

Given   the   above   information   regarding   the   solar   system   barycenter,   it   follows   that   the   Moon   doesn’t revolve   around   the   mass   center   of   the   Earth;   it   revolves   around   the   Earth   Moon   System   barycenter.      The Earth   Moon   System   barycenter   is   on   the   axis   between   the   center   of   masses   of   the   Earth   and   Moon.      The Moon   is   ~   1/82   of   the   mass   of   the   Earth   so   this   barycenter   is   about   3000   miles/4800km   from   the   center   of the   Earth   along   the   axis   between   them   (average   Earth   Moon   distance   240,000miles/380,000km).      The barycenter   of   the   Earth   Moon   System   is   always   within   the   Earth.      The   distance   to   the   Moon   also   varies   by about   30,000   miles,   or   50,000   km,   therefore   the   location   of   this   barycenter   within   the   earth   will   vary about   380   miles   or   600   km   from   a   point   3000   miles   or   4800   km   within   the   Earth,   during   one   revolution   of the   Moon   in   29   days.   The   barycenter   and   another   point,   the   anti-barycenter   (equal   distance   from   the center   of   the   Earth   along   the   Earth   Moon   axis   in   the   opposite   direction   to   the   barycenter),   are   two   points at which 4 of the Iasoberg bands (2 bands per point) are focused.
© iasoberg.com 2013

What is a Barycenter?

Barycenter   is   a   term   that   is   used   to   describe   the mass   center   of   2   or   more   celestial   bodies,   i.e.   stars and   planets   and/or   a   planet   and   moon(s).      The   solar system      barycenter      and      Earth      Moon      system barycenter are described below.

Earth Doesn’t Actually Orbit the Sun?

You   were   taught   that   Earth   and   other   planets   in   our solar   system   orbit   the   sun,   and   that   our   solar   system orbits   the   center   of   the   Milky   Way.   Did   your   science teacher   have   it   wrong?   Is   everything   you’ve   learned about   physics      and   gravity   wrong?      The   Earth   Doesn’t Actually   Orbit   The   Sun?   For   all   practical   purposes, what     you     were     taught     wasn’t     entirely     wrong. Although   the   Earth   does   generally   orbit   the   sun,   in the   strictest   sense,   it   doesn’t.   The   sun   and   other planets    each    have    their    own    gravity    force    which interacts   and   pulls   on   one   another.   The   result   of   this phenomenon   is   that   everything   in   an   orbital   system (like   our   solar   system)   orbits   the   center   of   mass   of the   system.   This   ‘center   of   mass’   of   the   solar   system is   called   the   solar   system   barycenter.    The   Earth, the   sun   and   everything   else   in   our   solar   system   orbit this barycenter – not the sun .
iasoberg
Barycenter 101
Solar Barycenter Chart, courtesy of R L McNish Calgary Centre of the Royal Astronom ical Society of Canada.

Where Is the Earth Moon System Barycenter?

Given    the    above    information    regarding    the    solar system   barycenter,   it   follows   that   the   Moon   doesn’t revolve    around    the    mass    center    of    the    Earth,    it revolves   around   the   Earth   Moon   System   barycenter.     The   Earth   Moon   System   barycenter   is   on   the   axis between    the    center    of    masses    of    the    Earth    and Moon.      The   Moon   is   ~   1/82   of   the   mass   of   the   Earth so   this   barycenter   is   about   3000   miles/4800km   from the   center   of   the   Earth   along   the   axis   between   them (average    Earth    Moon    distance    240,000    miles    or 380,000   km).      The   barycenter   of   the   Earth   Moon System   is   always   within   the   Earth.      The   distance   to the   Moon   also   varies   by   about   30,000   miles   or   50,000 km   so   the   location   of   this   barycenter   within   the earth   will   vary   about   380   miles   or   600km   from   a point   3000   miles   or   4800   km   within   the   Earth   during one    revolution    of    the    Moon    in    29    days.    The barycenter   and   another   point,   the   anti-barycenter (equal   distance   from   the   center   of   the   Earth   along the   Earth   Moon   axis   in   the   opposite   direction   to   the barycenter),    are    two    points    at    which    4    of    the Iasoberg bands (2 bands per point) are focused.
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Where Is the Solar System Barycenter?

The    diagram    displays    the    motion    of    the    solar barycenter   with   respect   to   the   center   of   the   sun (shown     as     a     yellow     dotted     line     circle).     A coordinate        system        (x-y    axis    =    white    lines)    is centered   at   the   center   of   the   sun.   The   First   Point of Aries   (0   degrees   celestial   longitude)   is   at   the   far right of the horizontal axis. In   a   single   star   system   like   ours,   most   of   the   time (but     not     always),     the     barycenter     is     located somewhere   within   the   star   itself.   However,   most barycenters     continuously     change     as     massive objects   (like   planets)   orbit   a   star.      If   an   unusual alignment   happens   where   a   large      percentage   of mass   is   on   one   side   of   the   star,   the      barycenter   can exist   outside   of   the   star’s   radius.   In   cases   of   2   star systems,   the   barycenter   will   be   located      between the    two    stars.    If    the    stars    aren’t    of    the    same      mass,   the   barycenter   will   be   closer   to   the   heavier, or    more    massive    one.    So    the    solar        system barycenter   and   the   sun's   location   are   dependent     on   the   motion   of   the   planets   and   other   massive objects   in   the   solar   system.   If   you   want   all   the gory   detailed   data   re:   the   position   down   to   the .00000001 of a degree longitude, you can go here .