All Questions
Tagged with the-sun coordinate
21 questions
15
votes
7
answers
4k
views
How to describe the Sun's location to an alien from our Galaxy?
Let's say you got to the planet orbiting other star in our Galaxy through the wormhole. You think that the travel was instant but you're not 100% sure and it is not exactly known. The planet is ...
- 161
0
votes
0
answers
121
views
Demonstration- formula for angle between horizon and ecliptic
The most precise and quite intuitive formula I could find online is here: https://www.celestialprogramming.com/snippets/angleBetweenEclipticAndHorizon.html
$$\cos I = \cos ϵ \sin ϕ − \sin ϵ \cos ϕ \...
1
vote
1
answer
148
views
Celestial Coordinates and Sun's degrees below horizon
I am struggling to understand the how the coordinates work.
Example: At vernal equinox RA=0 DEC=0, Does this mean the Sun is at its highest point at the equator?
If my mean solar time is 2h 30min, ...
- 19
1
vote
1
answer
109
views
At what time of the day of autumnal equinox the Sun's equatorial coordinates reach max value?
I'm trying to solve this task:
At what point in time of autumnal equinox day, at sunrise or sunset will
a) the declination of the Sun
b) the right ascension of the Sun
reach the maximum value?
I'm ...
- 1,017
3
votes
0
answers
63
views
How is the incidence angle of the Sun related to the lean angle of the Cooks pines?
Auracaria columnaris (Cooks pine) on average lean towards the equator. Most of the pines in the Northern Hemisphere lean southward and most of the pines in the Southern Hemisphere lean northward.
...
- 16.7k
2
votes
2
answers
2k
views
How to calculate geocentric transformation to heliocentric coordinates?
I have Sun data (lon+lat+distance) in geocentric coordinates:
but I want to visualize in heliocentric way. How to calculate that?
- 21
7
votes
2
answers
701
views
Different times of sunset at the same location due to elevation
Me and my friend were watching the sunset on the same location (at my country the latitude is approximately 40 degrees). I am at sea level and my friend is at an elevation. He observed the sunset with ...
- 71
0
votes
0
answers
284
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Calculating angle between the sun and a perpendicular to earth given lon/lat & time
If you had your longitude/latitude, and the time/date, how could I go about working out the angle between your normal and the sun?
At first I was doing a simplistic approach of assuming elliptical ...
- 101
3
votes
1
answer
260
views
Latitude of given altitude of Sun
From Question #6 of USAAAO First Round 2018
(1 point) For the following problem find the range in which the answer lies: on the day of summer solstice, on which geographic latitude is the sun ...
- 136
2
votes
2
answers
3k
views
Is the sun flipped on the other side of the world?
As the orientation of the moon is different in the northern and the southern hemisphere, is the orientation of the sun different in both hemisphere?
Does a sunspot appearing in the Sun northern ...
- 115
4
votes
1
answer
201
views
Is the longitude assigned to sunspots spherical or projected?
Sunspot maps are created from a projection of the sun, so the coordinates of sunspots (or active regions in general) are assigned according to it.
Do these coordinates correspond to actual spherical ...
- 399
3
votes
2
answers
290
views
Geographical Point of the Sun
I want to draw a Sun in a 3d scene, so I figured the easiest way would be to calculate the latitude and longitude of the point perpendicular to Sun position and then just move it "up".
As a starting ...
- 163
3
votes
1
answer
278
views
What does it mean that the Sun`s rotation axis is: RA 286.13° , Dekl: 63.87°?
first post here.
I found 1 related Question, which has not solved my Problem.
SHORT QUESTIONs VERSION:
Suns axis is 7,25° tilted from the ecliptic. But in which direction?
LONG QUESTION:
Nasa ...
- 164
2
votes
3
answers
3k
views
Calculate position of the Sun in ECEF
I'm making a very basic orbit simulator in C# using the Helix Toolkit.
I want to position the Helix lighting object at the sun, but also be able to calculate solar eclipse by the moon and earth for a ...
3
votes
1
answer
346
views
What is the abbreviation for solar time, hour angle of the sun?
I understand that the hour angle and declination can be abbreviated as (HA Decl), and rectascension and declination as (RA Decl). The hour angle of a star is of course zero hours at the meridian.
The ...
- 31
1
vote
1
answer
881
views
Converting Earth Moon Barycenter coordinate to Geocentric coordinate
I have Earth Moon Barycenter coordinate (J2000) generated from VSOP2013 in Astronomical Units,
...
- 23
3
votes
0
answers
94
views
How to get SOHO Satellite images' coordinates?
I'm working with images from LASCO C3 coronagraph
I'm able to download pictures from LASCO C3 using this form
https://sohodata.nascom.nasa.gov/cgi-bin/data_query
Then, I want to do some analysis of ...
- 31
3
votes
1
answer
544
views
Math for calculating the terrestrial longitude directly under the sun with time
I'm trying to calculate the longitude on the earth where it's noon at some time. (That is, the longitude which is coplanar with the plane defined by the sun and the earth's axis.)
Here is my python ...
- 131
9
votes
1
answer
2k
views
Given a date obtain latitude and longitude where is the sun zenith
Searching is easy to find terminator line (frontier between day and night) or the position of the sun in the sky given a position on the earth and a time; but I can't find how to obtain where is the ...
- 191
1
vote
2
answers
4k
views
How are East and West defined on other bodies of our solar system?
I noticed that East and West appear swapped on maps of the Sun, even though the Sun rotates around its polar axis in the same sense as Earth.
See for example below Sun disk with a Venus transit ...
- 124
7
votes
1
answer
3k
views
Calculate latitude and longitude based on date and sun
I can't seem to find this algorithm, if it exists. Can you calculate the longitude and latitude of where you are standing based on the date and the angle of the sun? Also, would the algorithm work for ...
- 179