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.