Ask Remember Me?

# Need my Cosmology math logic checked.

Asked Jun 20, 2009, 11:31 AM — 6 Answers
Background
Several years ago I was was watching the Science channel, and I heard the commentator It could have been Sagan or Kaku say to the affect; “When I finish saying this sentence it will take 2.25x10^8 years to return to this same point in the Galaxy.
For each orbit, the Sun traveled 150,000 light years of distance. Speed of the Sun

My question on this is, how far have I traveled from my Origin Point, My Birth in Light Years in that arc?
Or should it be considered as a straight line?

Known Factors and Bibliography
Sun travels at c.150mi/sec c.240km/sec
Speed of the Sun

The duration from my b-day to, lets say 12:00 midnight June 20, 2009. 1 hr and 45min before the start of the Summer Solstice, is 21,130days
Date Duration Calculator: Days between two dates

Wiki:
The speed of light
Speed of light - Wikipedia, the free encyclopedia

Methodology
Please bear with me, I did make it to Geometry in high school, but that was a while back.

D = s x t

D = 150mi/sec x 21,130days, at this point days need to be converted to seconds

D = 150mi/sec x (1,825,632,000sec. = 21,130days)

D = 273,844,800,000mi

To convert to LY divide by 5.879×10^12 (58,790,000,000)
Light-year - Wikipedia, the free encyclopedia

LY = 273,844,800,000 / 58,790,000,000 = 4.6580166695016159210750127572716 Light Years from Origin Point.

Correct? If it is I have to change my Profile Location.

Regards.....KUXJ

6 Answers
 Capuchin Posts: 5,319, Reputation: 3601 Uber Member #2 Jun 20, 2009, 12:24 PM
Your answer is roughly correct with respect to the center of the milky way (you might get a slightly better answer considering the sun's path as an arc). However the milky way itself will be moving much faster, swamping the local speed of the sun, I.e. Your absolute speed with reference to the center of the universe (if such a place exists) is likely to be much faster.
 KUXJ Posts: 975, Reputation: 484 Senior Member #3 Jun 21, 2009, 07:29 AM
Quote:
 Originally Posted by Capuchin your answer is roughly correct with respect to the center of the milky way (you might get a slightly better answer considering the sun's path as an arc). However the milky way itself will be moving much faster, swamping the local speed of the sun, I.e. Your absolute speed with reference to the center of the universe (if such a place exists) is likely to be much faster.
I knew this was going to make my head hurt.

It may not be the correct representation, but using the attached image.....

* The Solar system is the small circle.
* The Milky Way is the larger circle.
* The X,why,Z co-ordinates represent the center of the Universe "if such a place
* exists"
or could it stand for "my origin point".

If I understand correctly:

I have the relationship between the Solar system and Milky Way "roughly correct". Thank You.

What I need to do now is apply the Hubble constant to my result, if I can determine, within the Universe, the distance of "my origin point" to 21,130 days later, and counting.

Edited at 2:00pm edt, 19:00z

This last statement is incorrect as to "if I can determine, within the Universe, the distance of "my origin point" to 21,130 days later, and counting." all I would need to do is apply the H-constant, I think.....
Attached Images

 ebaines Posts: 10,047, Reputation: 5539 Expert #4 Jun 22, 2009, 06:02 AM
Quote:
 Originally Posted by KUXJ Background D = 273,844,800,000mi
So far so good....

Quote:
 Originally Posted by KUXJ [ To convert to LY divide by 5.879×10^12 (58,790,000,000) Light-year - Wikipedia, the free encyclopedia LY = 273,844,800,000 / 58,790,000,000 = 4.6580166695016159210750127572716 Light Years from Origin Point. Correct?
Not quite - you divided the distance by 5.879 x 10^10 instead of 5.879 x 10^12. Consequently your answer is too big by a factor of 100. You should have an answer of 0.0465 LY. Remember that a light year is a very, very long distance - it just didn't seem possible that you could travel over 4 light years in only 57 years.

By the way, given that the accuracy of the speed of light is given to only 4 digits, there is no point in writing out the results of the division to anything more than 4 decimal places.
 KUXJ Posts: 975, Reputation: 484 Senior Member #5 Jun 22, 2009, 09:05 AM
Quote:
 Originally Posted by ebaines it just didn't seem possible that you could travel over 4 light years in only 57 years.
Oh...I don't know, I'll be 58 in Aug. And the older I get, the faster time seems to go by

Thank You for the insight,

Regards

KUXJ
 KUXJ Posts: 975, Reputation: 484 Senior Member #6 Jul 20, 2009, 08:21 PM
Just an update:

I sent an email to NDTyson at the Hayden 'bout my question,
And we are in dialog whether the H0 or Newton's laws of orbital Mechanics should be used.

That's how it was signed. Might just be a member of his staff.

Home | Neil deGrasse Tyson

K
 KUXJ Posts: 975, Reputation: 484 Senior Member #7 Nov 6, 2009, 09:49 AM
Have received answer:

The Hubble constant remains irrelevant at these scales of distance and time. Simply Earth's rotation, Earth's revolution around the Sun, the Sun's revolution around the MIlky Way galaxy's enter, and the falling of the Milky way towards the Andromeda galaxy. There is no other relevant motion to your needs.

-NDTyson

So for now, it remains .0465 LY

Not your question?

 Thread Tools Search this Thread Search this Thread: Advanced Search

### Add your answer here.

Notification Type:

## Check out some similar questions!

Bleeding after being checked for dilation [ 5 Answers ]

Hey guys! Yesterday I went for my 35 week check up and everything was wonderful with baby Lia. The doctor went ahead and checked for dilation and effacement; I'm not dilated but I'm 50% effaced. Neato! Anyways, after I left the office I noticed I was bleeding a bit. It was a much as a...

Checked fuel delivery, still won't start [ 1 Answers ]

I have a John Deere L111 with a B & S Intek 20hp V twin engine, I looked at previously asked Q&A and went through the fuel system from the gas tank through to the fuel pump, all which are working great, it still will not start. I took a tblspn of gas as suggested, it started briefly then stopped....

Should sperm count be checked again. [ 3 Answers ]

My husband had a vasectomy three years ago. A year and a half ago he went back and had the staples removed. He said that the pressure was bothering him during sex. They never reconnected the lines though. Now my question is this......., Should he have his sperm count checked out again, maybe...

Getting ovaries checked out [ 5 Answers ]

Okay I got my blood results back on saturday and of course it was negative, I had gotten my period a couple days before my appointment, although this cycle was a very short one. My period lasted exactly 4 days, which has never happened before, normally it would b 5-6 days. Anyway, I told my...

Should I Get Checked for pregnancy [ 7 Answers ]

Last month my cycle started about a week late. When it did show up, it was kind of a hit or miss thing. One minute I was bleeding the next I wasn't. It lasted about four days, rather then my usual seven day cycle. Yesterday I took a pregnancy test because my family , especially my husband is...