All Questions
16
questions
1
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0
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34
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Orbital obliquity of the Earth
Consider that we have all the orbital parameters that characterize the Earth. How would one calculate the orbital obliquity of Earth?
One could argue that since the rotation of Earth doesn't change ...
- 1,213
16
votes
6
answers
5k
views
If another planet was opposite Earth, would we be able to observe it?
Imagine another Earth-sized planet, in the exact same orbit as Earth, but 180 degrees out-of-phase. In this arrangement, at all times, you would be able to draw a single straight line through space ...
- 461
0
votes
2
answers
394
views
What is Earth's linear velocity around the Sun?
I am creating a theoretical model of the Earth's tangential acceleration around the Sun (on an elliptical orbit, not circular). First, I will build a theoretical model, which is not influenced by any ...
- 115
2
votes
3
answers
98
views
Will August be always summer in the northern hemisphere?
Is the Earth orbit precessing, or are there other effects which will create a shift between our calendar (day counting), and the Earth's orbit?
I imagine these effects to be small, but I'm asking for ...
- 1,221
2
votes
2
answers
115
views
Why is the orbit of the Earth around the Sun very intricate?
The movement of the earth around the sun is very Goldilocky. Did it happen over the years as the orbit of earth averaged out into how it is now? Is there any chance of it (orbit) changing by itself in ...
- 731
0
votes
0
answers
250
views
A confusion between geocentric and heliocentric model [duplicate]
As per Ptolemy, he proposed firstly geocentric model and that model if one see with aspects of relativity he would find true. Here is an example how
Suppose you are in a train which is moving and you ...
0
votes
1
answer
1k
views
Is the orbit of Earth currently decaying?
As we know, interplanetary space is not completely empty. This would cause a drag to Earth, spiralling it towards the sun in a long enough timescale, which appears to be what has happened for many ...
- 1,223
-1
votes
1
answer
40
views
Gravitational effect of larger solar system to Earth orbit
Let's say our solar system enters to gravitational area of a larger solar system. Does Earth's orbit of sun get affected from this case?
- 181
0
votes
4
answers
1k
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Why is Earth rotating along $x$(day and night) and $y$(tilt, causing seasons) axis, but not along the $z$ axis (taking $z$ as the axis along orbital)?
I have read this:
http://en.wikipedia.org/wiki/Axial_tilt
It is obvious that the rotation of any planet is a combination of rotation along three axis x,y,z.
Lets take the z axis as the one being the ...
- 29k
15
votes
4
answers
10k
views
Can the Earth leave orbit if the population of humans and other live forms increases?
I don't know a lot about physics, but this seemed like the correct place to ask my question. I apologize in advance if it is a ridiculous one.
It's actually a two part question:
If the population of ...
15
votes
4
answers
3k
views
What would happen if the Earth was in a polar orbit around the sun?
This is a question that has been bugging me for a while now, I was wondering about the effects on the Earth if it was in different orbital situations to what it is now, and one of those was what would ...
- 161
7
votes
3
answers
179
views
How to measure the effects of the orbit around the Sun?
It is well know that we can measure the spinning of the Earth with a Foucault pendulum.
But, is there a similar experiment for the orbit of the Earth around the Sun? I would like to know if we could ...
- 12.5k
2
votes
3
answers
8k
views
True or false: the Moon was touching the Earth 1.2 billion years ago
A creationist website makes this argument for the 6,000 year old earth. I'm embarrassed to say I don't know how to do the math to evaluate the claim myself. However, the time scales involved seems ...
- 21
0
votes
1
answer
173
views
Why was Galilei "right"? [duplicate]
Considering that all frames are equivalent, isn't it up to the observer to say "The earth turns around the sun" or "The sun turns around the earth"? Isn't this more or less like arguing about which ...
- 2,598
5
votes
2
answers
1k
views
Deviation from Earth's orbit
How much orbital deviation is required for the Earth to get knocked out from current orbit so it either moves away from Sun or towards the Sun?
- 872