The perihelion is the point in the orbit of a celestial body where it is nearest to its orbital focus, generally a star. It is the opposite of aphelion, which is the point in the orbit where the celestial body is farthest from its focus.
But then helion comes from helios, meaning the sun. Luckily for us difference of 5 million kilometers is not really noticeable. I guess it only means that on the northern hemisphere the summers are less hot and the winters less cold then they would otherwise have been.
But then helion comes from helios, meaning the sun.
Sol from the Latin also means the Sun which is where the Solstices come from.
I guess it only means that on the northern hemisphere the summers are less hot and the winters less cold then they would otherwise have been.
I think it's more to do with the axial tilt or inclination of the earth.
This causes one pole to be directed more toward the Sun on one side of the orbit, and the other pole on the other side — the cause of the seasons on the Earth. Earth's obliquity oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle; the earth's mean obliquity is currently 23°26′13.3″ (or 23.43702°) and decreasing at about a rate of 47″ per century.
Then we've got the Magnetic North Pole wandering about all over the place. It's been told before to stop doing that and stay still, but it won't have it. It was last seen heading towards Russia at between 55 and 60 kilometres per year As of 2016, the pole is projected to have moved beyond the Canadian Arctic territorial claim to 86.4°N 166.3°W. Be interesting to see if Putin impounds it and claims it for Russia.
Waiting for Godot & salvation :-)
Why do doctors have to practice?
You'd think they'd have got it right by now
I know the seasons are affected by the tilt of the planet, yet when we are further away from the sun the earth in total receives less heat from the sun.
So there should be a (minor) difference from our current seasons when our planet would have a perfectly round orbit around the sun. So on the southern hemisphere the seasons should be amplified (summer close and winter far) and on the northern hemisphere they should be weakened (winter close and summer far).
I know the climate on the southern hemisphere is more moderate then on the north, due to the fact that the spatial distribution of ocean regions and continents is unevenly arranged between the northern and southern hemisphere. In the Northern Hemisphere, the ratio of land to ocean is about 1 to 1.5. The ratio of land to ocean in the Southern Hemisphere is 1 to 4.
These effects are far greater then the difference in distance from the sun.
The relative increase in solar irradiation at closest approach to the Sun (perihelion) compared to the irradiation at the furthest distance (aphelion) is slightly larger than four times the eccentricity. For Earth's current orbital eccentricity, incoming solar radiation varies by about 6.8%, while the distance from the Sun currently varies by only 3.4% (5.1 million km). Perihelion presently occurs around January 3, while aphelion is around July 4. When the orbit is at its most eccentric, the amount of solar radiation at perihelion will be about 23% more than at aphelion.
....
Perihelion currently occurs around January 3, so the Earth's greater velocity shortens winter and autumn in the northern hemisphere. Summer in the northern hemisphere is 4.66 days longer than winter, and spring is 2.9 days longer than autumn.
If you want visual explanation, there is a BBC series called "Orbit: Earth's Extraordinary Journey" presented by Kate Humble and Helen Czerski. It's not available on the BBC at the moment but you might find it if you do a search. But I cannot remember which episode it is in.
Eccentric as Earth's orbit may be, it's inhabitants are definitely much more so. (I could point at the current occupant of the WH as extreme example, but decline to do so...or did I just do that? Nevermind!).
The perihelion is the point
The perihelion is the point in the orbit of a celestial body where it is nearest to its orbital focus, generally a star. It is the opposite of aphelion, which is the point in the orbit where the celestial body is farthest from its focus.
But then helion comes from helios, meaning the sun. Luckily for us difference of 5 million kilometers is not really noticeable. I guess it only means that on the northern hemisphere the summers are less hot and the winters less cold then they would otherwise have been.
Happy independence day!
But then helion comes from
Sol from the Latin also means the Sun which is where the Solstices come from.
I think it's more to do with the axial tilt or inclination of the earth.
Then we've got the Magnetic North Pole wandering about all over the place. It's been told before to stop doing that and stay still, but it won't have it. It was last seen heading towards Russia at between 55 and 60 kilometres per year As of 2016, the pole is projected to have moved beyond the Canadian Arctic territorial claim to 86.4°N 166.3°W. Be interesting to see if Putin impounds it and claims it for Russia.
Waiting for Godot & salvation :-)
Why do doctors have to practice?
You'd think they'd have got it right by now
(No subject)
Waiting for Godot & salvation :-)
Why do doctors have to practice?
You'd think they'd have got it right by now
I know the seasons are
I know the seasons are affected by the tilt of the planet, yet when we are further away from the sun the earth in total receives less heat from the sun.
So there should be a (minor) difference from our current seasons when our planet would have a perfectly round orbit around the sun. So on the southern hemisphere the seasons should be amplified (summer close and winter far) and on the northern hemisphere they should be weakened (winter close and summer far).
I know the climate on the southern hemisphere is more moderate then on the north, due to the fact that the spatial distribution of ocean regions and continents is unevenly arranged between the northern and southern hemisphere. In the Northern Hemisphere, the ratio of land to ocean is about 1 to 1.5. The ratio of land to ocean in the Southern Hemisphere is 1 to 4.
These effects are far greater then the difference in distance from the sun.
The effects you need to
The effects you need to understand are eccentricity, obliquity and precession, collectively known as the Milankovitch cycles.
Very interesting reading
Very interesting reading about that indeed:
Glad to be of service. If
Glad to be of service.
If you want visual explanation, there is a BBC series called "Orbit: Earth's Extraordinary Journey" presented by Kate Humble and Helen Czerski. It's not available on the BBC at the moment but you might find it if you do a search. But I cannot remember which episode it is in.
Eccentric as Earth's orbit
Eccentric as Earth's orbit may be, it's inhabitants are definitely much more so. (I could point at the current occupant of the WH as extreme example, but decline to do so...or did I just do that? Nevermind!).
Seti Classic Final Total: 11446 WU.
And by not wanting to provide
And by not wanting to provide the example you provided you show just how eccentric we humans are?
Jonathan_76 wrote:And by not
See thread title.
Seti Classic Final Total: 11446 WU.