# Questions tagged [pole]

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### For what period of time can planets be viewed from the North Pole as just being there?

I would like details on observations (since North Pole is not possible, approximately around the North Pole) which tell us for how long are planets visible from the North Pole? I understand that ...
• 219
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### How did ancient models explain 6 months of day and night at the respective poles?

We know that the Arctic circle experiences 6 months of continuous day light during the sun’s apparent northward journey (to the solstice) and vice verse for the Antarctic region. This is attributed to ...
• 219
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### Draco, Thuban and Northern Ecliptic Pole

I want to try confirm my thoughts on the position of Thuban (Alpha Draconis) in relation to the Northern Ecliptic Pole (NEP). I have been asked to specify how many degrees Thuban is from the NEP today ...
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1 vote
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### Altitude of Polaris is latitude

How to prove geometrically that the altitude of Polaris is equal to the latitude? I have seen in handouts that the altitude of the pole star gives the latitude of that place.
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### Converting Invariable plane to J2000 ecliptic

I've been following the answer given by Mike G here: How to calculate the orientation of planets at current epoch to get planets to have the correct orientation in my program, but all the angles are ...
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### When (yyyy-mm-dd) does the north pole of uranus most nearly point towards the sun?

When (yyyy-mm-dd) does the north pole of uranus most nearly point towards the sun? The information I've found suggests this happened in 1944 or 1945, but would like to find a more precise date or ...
• 31
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### What should be the "poles" for irregular shaped bodies?

Continuation of: What is the definition of a "pole" of a celestial body? uhoh's answer says that distinct bodies should have a center of mass. If the body is spherical, then the COM will be ...
• 5,191
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### What is the definition of a "pole" of a celestial body?

What is the definition of a "pole" of a celestial body? Earth's pole is defined as it's rotational pole. The North and South Poles are the two points on Earth where its axis of rotation ...
• 624
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### How would Aurora look like if no magnetic field was there to protect the Earth? [duplicate]

The greatest part of the Earth is protected from the Solar wind by its magnetic field. This field makes the wind particles (mainly protons and electrons) the beauty of Aurora appear. Suppose the ...
292 views

### How dark/bright are polar nights?

During the polar night directly at the pole the Sun sets once and—after a period of twilight—stays down for months at a time. The only sources of non-human-made light are the stars, the auroras, and ...
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### Why do the magnetic field lines of the earth go from south pole to north pole?

I saw these figures and could not get why the magnetic field lines are not pointing from the north pole towards the south pole but they do the opposite. Or also this picture which is about magnetic ...
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### Counter clockwise rotation of storms at Jupiter's north pole. What explanations have been proposed?

On Earth, high pressures and low pressures occur interchangeably. So that where two pressure systems intersect, they move the air in the same direction. But as Juno revealed the first observations of ...
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### How are cardinal points on horizon defined?

How are the cardinal points (North-East-South-West) defined? On equatorial regions it is somewhat obvious. But what about the higher latitudes? If the pole star is up above the sky instead of horizon, ...
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### If the axis of the Earth was through Greenland, what would the north celestial pole be? [closed]

If the axis of the Earth was through Greenland, what would the north celestial pole be?
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### Does Polaris have a trail in the sky timelapse?

I came across few sources that claim Polaris movement cannot be observed with the naked eye. But then, I saw images of the star trails (timelapse), and they clearly show Polaris not quite at the true ...
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### Is there any data source for the rotational axes of bodies in the solar system?

I have found several right ascension and declination coordinates for the poles of bodies in the solar system, but there seems to be no comprehensive source that is easily uncovered with Google etc. ...
• 101
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### How to explain that Polaris is a circumpolar star in the sky of any North America city?

Circumpolar star definition: the stars that remain perpetually above horizon. My explanation: Latitude affects the constellation we see and Polaris(the North star) has altitude of approximately 89.4 ...
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### Which moons have cold traps? (i.e. low ecliptic inclination in orbital and rotational axes)

Both the Moon and Mercury have polar cold traps in polar craters, with signs of volatiles. This is of course not as interesting on a moon in the outer Solar System which consists of volatiles anyway. ...
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### Why does the Moon never set in Svalbard, Norway?

I heard in a documentary that, in Svalbard (Spitsberg), Norwegian archipelago in the Arctic Ocean, the Moon never sets. Why? A drawing would certainly help.