# Tagged Questions

Questions on the astronomical applications of Mathematica.

68 views

### Working with StarData Versus AstronomicalData

Using AstronomicalData I could easily do something like: ...
129 views

### Plotting Earth's position with units

I'm trying to plot the Earth position with the Sun in the origin. I have two lists like this: ...
4k views

### Composition: how to make a day and night world map?

Given the following world images: ...
166 views

### How to get star coordinates for a given time

Fixed in 10.3.1 In the documentation of StarData, there is an example that shows how to get the altitude of Sirius at a given time (in the horizontal coordinate ...
218 views

### How can I get curated data to be expressed consistently in SI units?

AstronomicalData objects are consistently in SI units: ...
2k views

### Beautiful dance of the Earth and Venus around the sun

I have seen very nice dynamic graphics created by users of Ma. I would like to get help whether the following graphics can be created using Ma. I was not able to create the dynamic picture here. ...
265 views

### Interstellar Image Effects

I'd like to know how to create this type of gravitational lensing effect in an image (here are some star fields from the hubble) "I wrote down the equations and I tested them in Mathematica by ...
297 views

### GeoGraphics - mapping the Moon

The link here shows a nice way to depict the map of the Moon in Mathematica. But is there a way, to center the Mollweide projection onto the far side of the Moon?
141 views

### Inaccurate Heliocentric coordinates of PlanetaryMoonData

I have noticed that the heliocentric coordinates obtained with PlanetaryMoonData are very inaccurate. Fore example, consider the Galilean moons of Jupiter: ...
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### Heliocentric coordinates in PlanetData

I tried to use planets' HeliocentricLongitude and I wonder if anyone has any insight on what coordinate system they use. I took vernal equinox times from http://ns1763.ca/equinox/eqindex.html and ...
130 views

### How to add moon to orbit Earth that Orbit Sun

I want to add moon(Blue) that orbiting earth(Red). while Earth is orbiting Sun. this is my code so far that consist of earth, sun and moon. how to write a code so that Moon is orbiting earth instead ...
355 views

### Can I create a radar chart of sunrise/sunset times for a year

Can I create a radar chart (or just a simple curve) of sunrise/sunset times, for a given location thougout a year? It would be something like this, but with a smooth curve: Can it be done in ...
41 views

### Plotting the Equation of Time: SiderealTime and SunPosition

The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of reconcile a difference. The two times that differ are the apparent ...
3k views

### The Orbit and Perigee of the Flamsteed comet

Historical context This year we have the 330-th anniversary of the Battle of Vienna - one of the great formative events of European history, it took place on September 12, 1683. Kara Mustafa, Grand ...
2k views

### What is the closest star to Earth other than the sun?

How to find the Sun's nearest neighbor star using Mathematica? I tried but it didn't work
136 views

### 3D orbits of moons around their respective planets

I have seen a lot of solar system models (both animated and not), but I am trying to replicate the same thing with moons. Either just one planet and its lunar system or the our whole solar system with ...
232 views

### Extracting and displaying data from GW150914 hdf5 files

Has anyone looked at the LIGO data using Mathematica or know how to do this? I'm not familiar with the hdf5 format but I've been able to import the data, consisting primarily of 131,072 floating ...
138 views

### How to find the Andromeda Galaxy

I would like to find the Andromeda Galaxy ($M31$) with the unaided eye. One way is to use the following image and graphic but I can’t find it just by looking in a dark sky. It is hard to detect ...
70 views

### Convert star name into entity value

I have a list of star names: stan = Select[#, Last[#] < Quantity[153.5, "LightYears"] &] &@ StarData[StarData[], {"Name", "DistanceFromEarth"}] ...
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### Lack of precision in solar declination leads to odd Fourier result

Here's the sun's declination for a 10 year period (roughly 2000-2010): ...
116 views

### Impact Crater Sim. with added criteria

I have been trying with out success to edit this impact crater simulation script into producing a variable which calculates crater density. In addition I have been trying to figure out how to ...
198 views

### ParametricNDSolve[ ] and NMinimize[ ] in Combination

I have the following code that is used to simulate a spacecraft orbiting Mars, and uses ParametricNDSolve to vary the spacecraft's initial conditions using a parameter value ...
197 views

### Series solution of the Lane-Emden equation

I have the following problem: I'd like to show how the Lane-Emden equation would look like if someone would solve it as a series. Here's the code: ...
267 views

### Solving the path of Earth around Sun

This maybe isn't a universally helpful question. Maybe a little of a code dump. But here goes. I'm trying to solve the path Earth moves around Sun from Earths mass, Suns mass, Earths initial velocity ...
435 views

### Impact Crater Simulation

I have been trying to model crater formation on a given planetary surface - $500\,\textrm{km}^2$. The locations of impacts are random, however, if an impact is within $30\,\textrm{km}$ of another, the ...
150 views

### Confused by result of MoonPosition when running on Linux [closed]

I've just switched from Windows to Linux and am running Mathematica 10.1 on Ubuntu 14.04. MoonPosition[] Gives me: ...
2k views

### How do I compute sidereal time and JD?

There was once a package that provided a wide range of functions for computing astronomical information. This package now appears to be out of date; but as near as I can tell, many of the useful ...
888 views

### Only final result from NDSolve

Finally, I started to play with differential equations in Mathematica. And I have faced the problem, which seems to me so basic that I'm afraid this question is going to be closed soon. However, I'...
312 views

### Earth to Mars Interplanetary Travel Escape Velocity [closed]

I'm trying to create a script that simulates interplanetary travel from Earth to Mars using a Hohmann transfer, but I'm having a few difficulties getting the correct escape velocity. I'm using an x-y ...
232 views

### Finding planetary conjunctions with Mathematica (project-level) [closed]

Summary: What's an efficient way of finding planetary conjuctions with Mathematica using the SPICE kernels, and without using AstronomicalData (which I believe is less efficient). NASA publishes ...
143 views

### Creating an orrery

I am interested in creating an orrery, ideally with SystemModeler. I have been experimenting with the MultiBody library since that allows you to do animations. The most relevant example seems to be ...
341 views

### Using ParametricNDSolve and NMinimize to find accurate interplanetary trajectory arrival periapse radius

I have an interplanetary trajectory simulation that calculates the required velocity (using a Lambert solver) and escape angle for a spacecraft to travel from Earth to Mars. This model does not use a ...
129 views

### Computing planet conjunctions with 2D circular orbits still hard?

All methods I've seen for computing planetary/stellar conjuctions (when two planets or a planet and a star appear close together in the sky because their angular separation, as measured from Earth, ...
304 views

### GeoProjection for astronomical data - wrong ticks

Here is an excellent answer to what I wanted to do, and it works like a charm. Unfortunately, when I want to change it a bit, it fails. For setting the stage, here is the datafile, and this is my ...
709 views

### Using map projections with astronomical data

I noticed that all important "Geoprojections" are available in projections for a spherical reference models: GeoProjectionData function; 1 - I am trying using the sinusoidal projection for ...
46 views

### PlanetData “VelocityAroundSun” giving inconsistent answers

My goal is to create a ListPlot showing the Earth's orbital speed over the course of a year, with one datapoint per day. I'm seeing problems long before I even get to the point of plotting the data! ...
692 views

### p-iteration algorithm to solve Lambert's problem for interplanetary trajectories

I've been reading up on using the p-iteration method to solve Lambert's problem for choosing the correct interplanetary trajectory between two planets given the ...
596 views

### Right Ascension and Declination in astronomical functions

In the process of answering this question, I was forced to confront the various astronomical coordinate systems used by Mathematica. Background In astronomy, positions of celestial objects (stars, ...
94 views

### Is there a problem with some of the curated Star Data?

I'm not really sure if I'm doing something wrong, or if there's a problem with some of the Mathematica curated data on stars. My problem is this: I'm trying to find the location (latitude and ...
5k views

### Creating a simulation of our Solar System

As the title says, my objective is to create a simulation of the motion of the planets in our Solar System using Mathematica. All the theoretical background regarding the equations of motion of ...
115 views

### Finding Minimium Periapse Distance Between Spacecraft and Planet

I have the following simple model that simulates a spacecraft orbiting Mars. What I'm hoping to do is be able to find the periapse radius of the spacecraft as I did below, except instead of using ...
1k views

### Combining Gravity Turn and Orbit Models

I have a mathematical model for the motion of an orbiting spacecraft about Earth: ...
97 views

### How to find µ (Gravitational constant mass product) with PlanetData?

I would like to use PlanetData to get µ, the product of the Gravitational constant G and a ...
452 views

### Generate a list of symbols for the planets

I would like to generate a list of the symbols for the planets to include in a nice table with other data. How can I programmatically generate (eg. using a pure function) the symbols from a list of ...
346 views

### Segmentation of sunspots

I recently went for a walk with my camera and snapped a few pictures of the sun. The pictures didn't turn out too well, but this was to be expected without a telescope. I thought it might be a nice ...
113 views

### MoonPosition and TimeZone support

With this question, I noticed some some weird results of MoonPosition. Consider the following code: ...
61 views

### Accessing Coordinates of Astronomical Data, e.g. Declination of all Galaxies

I am trying to access the coordinate information of all galaxies, stars, etc, available to the new astronomical data incorparated to Mathematica. However, the suggested (documented) approach fails. ...
148 views

### Finding minimum fly-by radius between Mars and spacecraft from interpolating function

I've written an interplanetary trajectory solver/plotter that plots the path taken by a spacecraft on an Earth-Mars mission, but have run into a little trouble when the spacecraft actually reaches ...
479 views

### Geocentric, Earth-fixed, coordinates of Sun, Moon (and others objects eventually)

I know I can get "HelioCoordinates" of the Earth and the Moon with ...
355 views

### Align stars in multiple images

I hope that you find this question interesting and that this will help others with similar problems as this configuration is not so particular. My problem I have multiple images of a particular ...