If you type into the table press tab (->|) or return to update the table.
Set your location. You can select from the supplied list or change the
name, latitude & longitude entries.
You can pass a location to this web page by adding a query string to the
URL. It should look something like these examples
Name is any text string, note the way of putting a space in the examples.
The script will do a pattern match against it's known locations so you only need to supply
the name for places in the supplied list.
Latitude is positive if North.
Longitude and Time Zone are positive if East
of Greenwich. Do NOT include daylight saving time in the TZ use DST.
Check the required date (year:month:day), Civil Time, Time Zone, and
the Daylight Saving Time flag, which defaults to your computer clock
and change if necessary. The Get Date/Time/Zone button reads your computer
clock and attempt to work out if daylight saving is on.
Select the ephemeris computation you want. Start with the daily
ones, those covering several days are a bit slow.
Note - The planetary positions appear to be accurate to about a minute of arc
out to Mars. The gravitational affects of Jupiter, Saturn and Uranus on each others orbits
are not allowed for, at worse this can be about a degree for the position of Saturn.
For more details see the
tutorial on computing planetary positions
If you want simple sun rise/set and moon phase routines
click here.
Latest changes:
31 Dec 2009 small change to index.html if user changes latitude or longitude.
18 March 2009 change to moon.js to print RA the same way.
17 March 2009 changes in index.html, util.js, sun.js and planets.js to print RA minutes to 1 decimal place.
11 March 2009 corrected observer.js for daylight saving time changes not on the last Sunday of the month
13 August 2008 added and changed some sites based on stellarium sites list
21 April 2008 moved one line in index.html to correct DST
Version 7.1 change to display the local time for the selected observatory. If you have a local copy you need to reload index.html, observer.js, datetime.js & util.js for
the version 7 changes.
Removed the get date/time/zone button, use reset instead.
Added code to reset1 to convert to observers local time