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Mars will get a close-encounter with a comet this weekend

POSTED BY: Jeffrey Bryant
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I've been working w/the solar system data plots. Here is my version of the Siding Spring comet orbital path metadata - except with the planets given some scale and surface imagery.

It is created using an interactive CDF viewer available at http://theoryofeverything.org/MyToE/?page_id=755 (Selecting the interaction pane for Universal NBody gravitational simulator and selecting the current "Solar System" Epoch. Siding Spring
POSTED BY: J Gregory Moxness

I completely agree George. I started to write out a tutorial for myself but got side-tracked. I think that the content of what's available in the Entity-verse is a moving target: all being added to as the curated data content on the cloud expands. So, the discovery of things (from what I can tell) often depends on using the Option-= key combination for Entity discovery.

And a key thing that separates these Entity-related items from "core Mathematica" for me is the speed issue. Accessing that data is vastly slower than any local computation, so that limits a number of things that one might want to do. An example is the graphic above if one tries to make it interactive using a Manipulate to move the date. So there's a conceptual difference between how one envisions code written that makes use of these curated data on the cloud a code that does not...

POSTED BY: David Reiss

I have a lot of trial and error to discover how to get an EntityValue and use it. A lot of the documentation gets the entities from Wolfram|Alpha (or the equivalent key combination), and there seems to be some art to using the resulting structures. Any chance of a tutorial sometime?

The code works now, of course, and I will be reading the entrails.
POSTED BY: George Woodrow III

Works fine now... I guessed you were using a pre-release version....
POSTED BY: David Reiss

Looks like I had a missing set of curly brackets around the Qualifier specification in the first EntityValue call. The released versions don't like that. I have edited the code in the original post above. Hopefully this should now work.

POSTED BY: Jeffrey Bryant

I get the same error. OS X, Mathematica 10.0.1.0
POSTED BY: George Woodrow III

When I execute this I get this error message:

Coordinate QuantityMagnitude[Missing["UnknownQualifierSyntax"], "AstronomicalUnit"] should be a triple of numbers, or a Scaled form.

and a pink box'd result without the planets in the graphic:

enter image description here

The problematic portion of the code is 

QuantityMagnitude[
 EntityValue["Planet", 
  EntityProperty["Planet", "HelioCoordinates", 
   "Date" -> DateObject[{2014, 10, 19}]]], "AstronomicalUnit"]

which, for me, returns

{QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"], 
 QuantityMagnitude[Missing["UnknownQualifierSyntax"], 
  "AstronomicalUnit"]}
POSTED BY: David Reiss
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