# 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 system).

However, when I try to run the example code

StarData["Sirius",
EntityProperty["Star",
"Altitude", {"Date" -> DateObject[{2014, 4, 9, 22, 0, 0}]}]]


the result is

Missing["NotAvailable"]


StarData["Sirius", EntityProperty["Star", #]] & /@ {"Altitude",
"Azimuth"}
StarData["Sirius",
EntityProperty["Star", #, {"Date" -> Now}]] & /@ {"Altitude",
"Azimuth"}


I get the correct output for the first command and

{Missing["NotAvailable"], Missing["NotAvailable"]}


for the second, which is very strange. Is this a bug with the EntityProperty function?

• It appears there was a server-side change that's causing this to fail when it shouldn't. I've notified the wolfram developers about this issue, and hopefully it will be fixed soon. – Nick Lariviere Apr 3 '15 at 16:34
• The astronomical curated data functions seem to be working normally with the current versions. Can somebody else confirm this? – J. M. will be back soon May 31 '16 at 9:49
• @J.M. I can confirm it works in 10.4.0. Thanks for the heads up. – shrx May 31 '16 at 10:01
• This works in 10.3.1, too. – QuantumDot May 31 '16 at 11:05