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Astronomy Mathematica Wolfram|Alpha Curated Data

Altitude of Polaris in Mathematica 10 and W|A

Hans Milton

Posted 10 years ago

For horizontal coordinates of stars, I have noted that StarData in Mathematica 10 returns values I don't expect. Taking a simple example, the altitude of Polaris. Regardless of date or time of day it will be close to the observers latitude. My home is near the 64th parallel. For latitude 64N, v9 gives a reasonable value: But not so in v10: And a query directly in W\|A gives the same, wrong, answer: Changing $GeoLocation has no effect

POSTED BY: Hans Milton

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Hans Milton

Posted 10 years ago

Yes, it works now. Thanks.

POSTED BY: Hans Milton

Jeffrey Bryant

Jeffrey Bryant, Wolfram|Alpha, LLC

Posted 10 years ago

With this week's push to production, these inputs should now work with the "Location" qualifier specified: StarData["Polaris", EntityProperty["Star", "Altitude", {"Date" -> DateObject[{2014, 7, 31, 22, 30, 0}], "Location" -> GeoPosition[{64, 20}]}]] PlanetData["Mars", EntityProperty["Planet", "Altitude", {"Location" -> Entity["City", {"NewYork", "NewYork", "UnitedStates"}]}]]

With this week's push to production, these inputs should now work with the "Location" qualifier specified:

StarData["Polaris", 
 EntityProperty["Star", 
  "Altitude", {"Date" -> DateObject[{2014, 7, 31, 22, 30, 0}], 
   "Location" -> GeoPosition[{64, 20}]}]]

PlanetData["Mars", 
 EntityProperty["Planet", 
  "Altitude", {"Location" -> 
    Entity["City", {"NewYork", "NewYork", "UnitedStates"}]}]]

POSTED BY: Jeffrey Bryant

Jeffrey Bryant

Jeffrey Bryant, Wolfram|Alpha, LLC

Posted 10 years ago

It is a regression. Its being investigated.

POSTED BY: Jeffrey Bryant

Jeffrey Bryant

Jeffrey Bryant, Wolfram|Alpha, LLC

Posted 10 years ago

If you want to get your Alpha query to support a different observation location than where it thinks you are, you need to modify the input string to include a hard coded date and location such as here: http://www.wolframalpha.com/input/?i=altitude+polaris+on+July+31+2014+22%3A30+from+lat+64+long+20 time zone isn't specified so it should default to your time zone. As for getting the StarData query to work with the "Location" qualifier, it's being looked into.