Questions tagged [ecliptic]
The ecliptic tag has no usage guidance.
34
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Why does the Sun track out a seemingly sinusoidal path on the celestial sphere?
The question arose because I wanted to understand the path of the ecliptic after reading about it here: https://community.dur.ac.uk/john.lucey/users/solar_year.html
Is the sinusoidal path due to ...
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0answers
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Where and when will someone on Earth be standing with the floor parallel to the Ecliptic plane?
I have been trying to figure this out and I think the answer might be - once per day for anyone living on the Tropic of Cancer or Capricorn. Is that right? To be clear - I want to know where on Earth ...
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1answer
84 views
Sun and moon's orbit in ecliptic coordinates using skyfield
I am new to using skyfield, is there any doc or help file that can show me on how to get the orbit of Sun and moon in ecliptic coordinate for a particular date and ...
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0answers
171 views
Orbits of planets in ecliptic coordinates
Is it possible to get the ecliptic coordinates of orbits of planets for a specific date and time? Does the ephemeris data of planets help in constructing that? Any help on this would be helpful. I ...
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1answer
110 views
Ecliptic line plot in a map
Is there any url that can give me data of ecliptic line that i can plot in a map. i.e i need earth's latitude and earth's longitude of ecliptic line for a specific time and date. Right now i only ...
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64 views
Ecliptic line data [duplicate]
I would like to get the data of ecliptic line with respect to celestial equator for a particular day.
Is there any specific URL that can give me this. I only have data for declination of Sun and the ...
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2answers
314 views
How do you draw the ecliptic on a celestial sphere sketch?
I don't really understand how it's drawn on sketches of the celestial sphere. At first I thought it goes through east and west, but it does not. How do you know where to draw it?
Example from Roy and ...
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1answer
171 views
Can Eight Retrograde (seen from Earth) planets occur?
First of all, for the purposes of this question Pluto is a planet. So the eight planets being considered are Mercury, Venus, Mars, Jupter, Saturn, Uranus, Neptune and Pluto.
My question is: can all ...
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3answers
249 views
Why is the equinoxes only 2 days and not more?
The earth is tilted at 23.5 degrees which means that in the solstices the north/south hemisphere is more radiated by the sun and the tilt to the sun is maximum.
In the equinoxes, the tilt is not ...
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4answers
217 views
Is the equinox Sun always at the same zodiac sign in the ecliptic belt?
During the year the Sun moves along the ecliptic passing all the signs of the zodiac belt, in my understanding. This means that it takes ~1 month to go from one zodiac sign to the next.
The ...
3
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1answer
144 views
Why does moon's highest altitude change during the year
I came across a question in which moon's highest altitude had to be calculated as seen from a certain latitude, also the month and the hour and the constellation in which moon would be in had to be ...
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Recreating Observer Ecliptic Lat/Lon from JPL Horizons using SPICE toolkit
I apologise if this is the wrong place to ask. I am trying to recreate part of the calculations by the JPL Horizons system using SPICE. Specifically the Observer Ecliptic Latitude and Longitudes.
I'd ...
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0answers
64 views
Did Eudoxus describe the eclipitic on his sun motion model?
In the description of Eudoxus’s model for the sun he says one the three circles which describe solar motion is “the circle which runs along the middle of the zodiac”. Does this refer to the ecliptic ...
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0answers
115 views
What is the great (platonic?) year? How could it be explained in laymen's terms?
How could a great year be explained in laymen's terms?
According to the definition in NASA's Aerospace Dictionary it is a complete cycle of the equinoxes around the ecliptic that completes in 26000 ...
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2answers
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What is meant by sun's path through zodiac
I read somewhere that sun's daily course and complete cycle is visible in the ecliptic belt by zodiac constellations.
I didn't understand what that means closest I could find online is: https://www....
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1answer
114 views
Why is there free magnesium in the ecliptic (if there is) and why would some be orbiting within the ecliptic plane but retrograde?
This answer to the question What direct or indirect observations of dust can one make by eye or with binoculars? mentions Brian May's thesis and it's connection to Zodical Light:
Brian May (CBE):
...
3
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0answers
109 views
location of the sun on the celestial sphere
The Sun, in its apparent motion along the ecliptic through the year, passes over the background of distant stars. However, given that we can't observe those stars due to the brightness of the Sun, how ...
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1answer
628 views
Moon inclination
The Moon is inclined to the ecliptic 5.15 degrees, and the equator of the Earth tilts 23.44 degrees. Since the Moon's ascending node to the ecliptic rotates, the Moon's inclination to the Earth's ...
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0answers
49 views
What does Ptolemy mean by “a line drawn from the centre of the earth through the centre of the moon to a point on the ecliptic”
This is from a translation of Ptolemy's Almagest
Hence it necessarily follows that the straight line draw n from the centre of the earth (which is the centre of the ecliptic) through the centre of ...
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1answer
133 views
Why do some solar eclipses' umbra cross arctic/antarctic regions?
The ecliptic (Earth's orbital plane) is inclined 23.4 degrees. This is the same as Earth's axial tilt. The Moon's orbit is inclined 5.145 degrees to the ecliptic.
Therefore, the maximum latitude ...
3
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1answer
264 views
360 degree equirectangular projection of all naked eye stars with precessional motion for simulating
For many years now I've been using Voyager sky simulator by Carinasoft. The projection selections are great, but Equirectangular doesn't seem to one one of them. Is there a program out there that does ...
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4answers
859 views
How did the Ancients understand the ecliptic using the Ptolemaic system
I studied the Farnese Atlas and I wonder how did the Ancients discover the ecliptic, the equator, etc. with the Ptolemaic system namely without knowing that the Earth rotates on itself, especially for ...
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1answer
138 views
Does the Earth ever cross the Moon's path with respect to the CMB?
Title says it, really. As I understand, our total peculiar motion with respect to the CMB is 631 (+/-20) km/h, in the direction of 10.5h RA; -24 deg Dec (or rather away from 22.5h RA; +24 deg Dec, ...
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1answer
100 views
What's the name of the point where you are closest or furthest from the ecliptic?
Every 24 hour day, there is a point as the earth rotates about its axis, where a location on earth is the closest to the ecliptic and where it's the furthest. Do those two points have a name?
What I ...
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1answer
721 views
How does the earth's plane of orbit (ecliptic) vary over time?
Does the earth's orbital plane change with time relative to the distant stars? Does the Sun follow the same path through the zodiac (ignoring proper motions of the zodiacal stars)?
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1answer
318 views
Does the ecliptic precess? Does the Sun's rotation precess?
We know that the Earth, like a top, slowly precesses as it rotates. We know the Sun rotates, but does it precess as well? What about planetary orbits? Is the orientation of the ecliptic stable or will ...
4
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1answer
697 views
How to get the axial tilt vector(x,y,z) relative to ecliptic
According to the orbital plane XYZ, I understand that the axial tilt is the angle between the planet axis rotation and any normal of the plane (actually Z in right handed system). BUT, this is not ...
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1answer
410 views
Why is the Lunar Node in a daily motion?
I've read a lot about the Lunar Nodes online (on Wikipedia, astro.com and a bunch of other websites), but there is one thing I cannot figure out and the sources don't seem to clearly explain: why are ...
4
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1answer
146 views
Oscillation in tilt of the solar system
I know that the solar system is tilted 62.6° to the plane of the galaxy. I'm curious whether this angle changes over time, and what are the extents and time frame of any such oscillations if they ...
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2answers
314 views
Why did Mercury not appear to transit through the middle of the sun?
Why did Mercury not appear to transit through the middle of the sun (the equator)? I initially thought that this was because of the ecliptic, but, then I thought that actually we'd see it above the ...
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2answers
463 views
What visible star is closest to the ecliptic?
If we were to project the ecliptic out as an infinite plane, what visible star (besides the sun) would lie closest to it?
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1answer
184 views
Longitude of the Ecliptic
I originally went to math.stackexchange.com and they suggested I try here as well.
I'm trying to figure out how to calculate times of moonrise and moonset for a given position on the earth on a ...
2
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1answer
95 views
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. ...
3
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1answer
370 views
What constellations touch the 9-degree wide Zodiac?
Say Barry, could you abuse the answer-your-own-question feature of
this site, and answer the following question:
As noted in How many constellations in the Zodiac? the
ecliptic itself touches 13 ...
