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 Noon/Midnight/Reset buttons read 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
I'm very impressed with the map interface
provided by The photographers
Ephemeris you can use it to get your location and Sun and Moon information.
If you want simple sun rise/set and moon phase routines click here.
Latest changes:
11 April 2011: Correct Capella in stars.js (looks like was zeta Auriga in
original code)
06 January 2011: Correction to datetime.js to fix a typo.
27 December 2010: Added Calgary to observer.js in anticipation of future
changes.
20 December 2010: Minor changes to stars.js so constellation is listed
first.
22 April 2010 Correction to user.js for when DST changes on last day of
month.
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