Questions tagged [astronomy]
Questions on the astronomical applications of Mathematica.
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Checking the formula for solving the Poisson equation with an integral over all of space
EDIT: According to 2.2.3 Rigorous derivation, if we find the integral $u(x,y) = \int \int G(x,y,m,n)f(m,n) dm dn$ then we obtain a function that satisfies the Poisson equation $\nabla^2u(x,y)=f(x,y)$. ...
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Help me figure out how to solve the gravitational lens equations [migrated]
I want to simulate gravitational lensing. In the article LENSINGGW: a PYTHON package for lensing of gravitational waves there is this fragment [page 3]:
My research: As far as I understand, this is a ...
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AscendingNodeLongitude for the Moon at a given date
I have a question concerning AstronomicalData. If I want the declination of the moon for a given date, I use:
...
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Solving a ODE (Peeble's Equation) with initial condition a the maximum input range
I have a differential equation which is,
$$
\frac{d X_e}{dz} = \frac{C_r(z)}{H(z)}\times \frac{1}{(1+z)}\Big[\frac{38\eta T^3}{25\pi^2}\alpha (T)X_e^2 - b(T)(1 - X_e) \Big]
$$
Where
$$
\alpha(T) = \...
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How do I use StarData with HR number as input?
In Mathematica 13.1, it is simple to look up star data using the star name as input, like this:
StarData["Capella","EffectiveTemperature"]
...
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Calculating upper culmination of the Moon
I’m completely confused by the new astronomical data system in Mathematica. For every day in some interval, I want to calculate
{azimuth, altitude} of the Moon in ...
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AstroPosition[] years of validity
I'm using online version 13.3(?) attempting to compute the position of Jupiter. It looks like "AstroPosition[]" only returns values for years between 1900 and 2050. Outside of these dates, ...
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Astroposition function in wolfra cloud
I am trying to copy paste and compute the input given in this link for the movement of mars.
But wolfram cloud gives error.
https://reference.wolfram.com/language/ref/AstroGraphics.html
When compute ...
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Entering Right Ascension in AstroPosition [closed]
In the new Mathematica 13.2 the AstroGraphics let you plot the sky, e.g. centered at a specific coordinate. However, I cannot figure out how to enter efficiently the value for {right ascension, ...
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Location of the point on Earth with the Sun at the zenith
This should be an easy question, but I don't know the correct syntax.
I'm trying to create an animation based on NightHemisphere during a year. For each day, the instant correspond to the time of the ...
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Performance improvement of array setup and processing
I need to improve the speed of the following algorithm:
Take a list $x={x_1,...x_n}$. For each integer $i=1,..n$ construct the following list assuming $z=x_i$ if $i=1$ and $z=x_{i-1}$ otherwise:
$X_i=...
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Path of moon orbiting the Earth [closed]
I'm trying to make an animation showing the path of the moon orbiting around the earth, but I'm having some trouble plotting it. For some reason, Mathematica doesn't give me any error messages but ...
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Constructing Wolfram Alpha Query for Solar Position
When I use Mathematica calls to WolframAlpha, it clearly knows about the motion of the sun, so I can request the solar declination at any date/time:
But I'm having great difficulty crafting a query ...
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Charting sun location throughout the year from a specified geographic location
I'd like to chart the location of the sun (azimuth and elevation) from a given location (e.g., Chicago) throughout the year for a stated year (e.g., 2010).
Here is the basic extraction of the current ...
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Units Question for PlanetData[..]
I asked a similar question yesterday, which was answered splendidly, but I missed adding a detail.
Attached is a command, its output, and the issue I have now. This outputs g/cm^3, but I'd rather have ...
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