If you type into the table press tab (->|) or return to update the
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
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
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
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.