<p>You can't, not with that information. However if you also have the date and time, you'll be good to go: there are plenty of sites in the web with this information, such as: <a href="http://www.stargazing.net/kepler/altaz.html" rel="nofollow">RA and DEC to ALT and AZ</a></p>

CC BY-SA 3.0
2014-05-21T20:18:52.017Z
2014-05-21T20:18:52.017Z
Jeremy
<p>Given a fixed coordinate location on Earth (i.e. a latitude and longitude), and a fixed equatorial coordinate location of a particular astronomical object in the sky (i.e. right ascension and declination), how can I calculate the horizontal coordinates as a function of date and time on Earth?</p>

<fundamental-astronomy><coordinate>
Calculation of Horizontal Coordinates
ruadath
# Calculation of Horizontal Coordinates

(Asked by: username_0 on 2014-05-21)

Given a fixed coordinate location on Earth (i.e. a latitude and longitude), and a fixed equatorial coordinate location of a particular astronomical object in the sky (i.e. right ascension and declination), how can I calculate the horizontal coordinates as a function of date and time on Earth?

**Tags:** fundamental-astronomy, coordinate

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## 1 answers

### Answer by username_1 on 2014-05-21. Score: 4

You can't, not with that information. However if you also have the date and time, you'll be good to go: there are plenty of sites in the web with this information, such as: [RA and DEC to ALT and AZ](http://www.stargazing.net/kepler/altaz.html)


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