gravity anomaly during solar eclipse.


by diabolic
Tags: anomaly, eclipse, gravity, solar
diabolic
diabolic is offline
#1
Jul28-09, 05:52 AM
P: 10
Hi all,

http://www.newscientist.com/article/...y-anomaly.html

the link given above elucidates that the gravity falls during the solar eclipse. I could not understand the logic. Can some one help me in understating the reason for this? why such discrepancy happens only during the solar eclipse why not during the new moon…. If duing the solar eclipse gravity falls then will there be an increase in gravity duing lunar eclipse?
Phys.Org News Partner Astronomy news on Phys.org
A star's early chemistry shapes life-friendly atmospheres
Unique pair of supermassive black holes in an ordinary galaxy discovered
Red stars and big bulges: How black holes shape galaxies
fleem
fleem is offline
#2
Jul28-09, 09:00 AM
P: 461
Quote Quote by diabolic View Post
Hi all,

http://www.newscientist.com/article/...y-anomaly.html

the link given above elucidates that the gravity falls during the solar eclipse. I could not understand the logic. Can some one help me in understating the reason for this? why such discrepancy happens only during the solar eclipse why not during the new moon…. If duing the solar eclipse gravity falls then will there be an increase in gravity duing lunar eclipse?
In the article I saw no answers to your questions. The article gives me the impression that there aren't really any guesses yet as to why there would be such an anomaly. It looks like a good experiment, though. The rumors of such an anomaly do need to be resolved first, before anybody starts working hard theorizing why there would be an anomaly.
diabolic
diabolic is offline
#3
Jul28-09, 10:21 AM
P: 10
Well I never told that there is an answer for the anomalies…. This paper just tells that the there is anomalies. I wanted to know why? as it is against my conventional thinking as I see g=Me/r^2

This leaves me that g should be constant and should not vary with eclipse.

Stratosphere
Stratosphere is offline
#4
Jul28-09, 12:50 PM
P: 360

gravity anomaly during solar eclipse.


Quote Quote by diabolic View Post
Well I never told that there is an answer for the anomalies…. This paper just tells that the there is anomalies. I wanted to know why? as it is against my conventional thinking as I see g=Me/r^2

This leaves me that g should be constant and should not vary with eclipse.
Are you sure that that formula is correct? I've never come across one like that, the closest I've seen is, g=(mG)/r[tex]^{2}[/tex].
diabolic
diabolic is offline
#5
Jul29-09, 12:12 AM
P: 10
Quote Quote by Stratosphere View Post
Are you sure that that formula is correct? I've never come across one like that, the closest I've seen is, g=(mG)/r[tex]^{2}[/tex].
Well even I meant the same….

I wanted to write gravity is proportional to mass of earth and inversely proportional to square of its radius.
Sorry!
Sorry! is offline
#6
Jul29-09, 10:49 AM
P: 571
Quote Quote by diabolic View Post
Well even I meant the same….

I wanted to write gravity is proportional to mass of earth and inversely proportional to square of its radius.
This looks more like a Force formula

[tex]F=\frac{GM_{e}M_{o}}{R^2}[/tex]
G is universal constant
Me = Mass of earth
Mo = Mass of object
R = Distance BETWEEN both objects as measured from centre to centre

The GPE equation is similar only its referenced differently. So it is all negative and it is divided by just the distance between objects not the squared distance.
flatmaster
flatmaster is offline
#7
Jul29-09, 11:43 AM
P: 502
You have a small force vector from the moon's gravity. You should experience nearly the same effect if the moon was nearly in the same direction of the sun from earth, but not necessarily eclipsing.

This wouldn't explain the phenomena in the article though. You should just be a bit lighter that day.
diabolic
diabolic is offline
#8
Jul30-09, 01:50 AM
P: 10
Quote Quote by flatmaster View Post
This wouldn't explain the phenomena in the article though. You should just be a bit lighter that day.
How much lighter?

One of the article claims it is less by ~8x10^-8 cm/s^2 ; but it will not match up right? Or have I missed some thing…..
Borg
Borg is offline
#9
Jul30-09, 05:55 AM
PF Gold
Borg's Avatar
P: 729
I don't know what the numbers are on this - it's just a thought. Is it possible that the sun's gravitational waves are rippling around the moon resulting in positive and negative wave reinforcement such that it is only strong enough to be observable when you are directly behind the moon with respect to the sun and at just the right distance from the moon?
Vanadium 50
Vanadium 50 is offline
#10
Jul30-09, 06:21 AM
Mentor
Vanadium 50's Avatar
P: 15,625
Quote Quote by Borg View Post
I don't know what the numbers are on this - it's just a thought. Is it possible that the sun's gravitational waves are rippling around the moon resulting in positive and negative wave reinforcement such that it is only strong enough to be observable when you are directly behind the moon with respect to the sun and at just the right distance from the moon?
This includes at least four suppositions without any support by data.
Borg
Borg is offline
#11
Jul30-09, 07:01 AM
PF Gold
Borg's Avatar
P: 729
Quote Quote by Vanadium 50 View Post
This includes at least four suppositions without any support by data.
Could you elaborate on what makes this a wrong idea? I really would like to know where I'm not thinking correctly.
flatmaster
flatmaster is offline
#12
Jul30-09, 04:15 PM
P: 502
Quote Quote by Borg View Post
I don't know what the numbers are on this - it's just a thought. Is it possible that the sun's gravitational waves are rippling around the moon resulting in positive and negative wave reinforcement such that it is only strong enough to be observable when you are directly behind the moon with respect to the sun and at just the right distance from the moon?
The gravitational pull of a chunk of mass in china makes it's way through the earth just fine to exert it's gravitational force on you. I wouldn't expect the moon to act any differently.
flatmaster
flatmaster is offline
#13
Jul30-09, 04:17 PM
P: 502
Quote Quote by diabolic View Post
How much lighter?

One of the article claims it is less by ~8x10^-8 cm/s^2 ; but it will not match up right? Or have I missed some thing…..

F=ma=GMm/r^2

gmoon = GM/r^2

G = grav constant
M = Moon mass
r = radius of moon's orbit minus earth's radius. I'll plug and chug
flatmaster
flatmaster is offline
#14
Jul30-09, 04:25 PM
P: 502
I get 3.8 EE-5 ms^-2, so that's about the same as the number above. They might have used perigee vs apogee.

That's about 4 millionth's of g.

So basically nothing.
diabolic
diabolic is offline
#15
Jul30-09, 11:19 PM
P: 10
Quote Quote by flatmaster View Post
I get 3.8 EE-5 ms^-2, so that's about the same as the number above. They might have used perigee vs apogee.

That's about 4 millionth's of g.

So basically nothing.
http://arxiv.org/abs/gr-qc/0408023

I doubt the answer is so straight forward. Please look at some of the conventional explanations of anomalous observations during solar eclipses.

If u think that force of moon has changed the gravity on earth why is that gravity did not increase during lunar eclipse?
Phrak
Phrak is offline
#16
Jul30-09, 11:32 PM
P: 4,513
Without having read the article, is the measured error induced by wishful thinking diminutive to systemic error?

-but perhaps my question should reside in the social science folder.
Chronos
Chronos is offline
#17
Jul30-09, 11:35 PM
Sci Advisor
PF Gold
Chronos's Avatar
P: 9,185
Its an old wives tale, nothing gravitationally exceptional occurs during an eclipse. The paper you cite is . . . suspect.
diabolic
diabolic is offline
#18
Jul31-09, 01:20 AM
P: 10
Quote Quote by Chronos View Post
Its an old wives tale, nothing gravitationally exceptional occurs during an eclipse. The paper you cite is . . . suspect.
which website are u talking about….. arxiv.org? I use to think it is a good site…..


BTW here is one more paper on this issue
http://adsabs.harvard.edu/abs/2003PhRvD..67b2002V

this also some there is some discrepancy


Register to reply

Related Discussions
Total solar eclipse General Astronomy 4
Eclipse between solar planets General Astronomy 2
During a solar eclipse....calculate forces.......etc Introductory Physics Homework 11
huyghen's principle & solar eclipse General Physics 0
Solar Eclipse General Astronomy 1