If your sun clock is not showing the correct time there are several things you can check:

1. In Sun Clock go to the Set up – Locations page. Check that the "Current location" is correctly set to your location. If not select the correct location from the drop down list.
2. If the current location is correct but the time is still wrong, check that the time zone selected in the time zone field on the Set up – Locations page is the correct one.
3. If the above setting are correct go to the Set up – General page and click on "Adjust Windows Date/Time". Check first that the time is correct and then that the time zone is set to the correct zone.
4. Finally if the times elsewhere in the world are correct but your time is wrong it is possible that our time zone database is in error. Go to the Set up – Time zones page, select your time zone in the left hand list, then check that the time zone settings are correct.

Go to the Set up – Locations page. You can select, or de-select, as many of the pre-defined locations that you like. The selected locations will be displayed on the world map and listed on the Clock page.

To enter a new city or other location :

1. Go to the Set up – Locations page and click on the "New location" button.
2. Enter the name that you want in the "Name" field.
3. Consult an atlas (please do not phone us up) to find the latitude and longitude of the location: e.g. Rome is 12.5 degrees East, 41.8 degrees North. Note that you do not need greater accuracy than this. Enter these values in Longitude and Latitude fields. Note that a Westerly longitude or a Southerly latitude should be entered as minus numbers.
4. Select the "label location". The label location determines where the label is relative to the location on the map. This is useful if you have several locations which are close to each other.
5. Choose your time zone from the Time zone list.

The new location will appear on the map and the new location will have become the "current" location. If you want a different location to be current then go back to Set up – Locations and select the location in the "current location" field.

The angles given are the celestial elevation and bearing of the sun and the moon as viewed from the current location. For instance, if standing at your location, the moon was due south and half way between the horizon and straight above, then sun clock would show the moon with a bearing of 180 degrees and an elevation of 45.

These show the locations on the earth’s surface where the sun and the moon are directly overhead.

When the moon is full the moon, earth, and the sun (in that order) are nearly in a straight line. When they are precisely in a straight line the shadow of the earth falls on the moon and hides it from the sun – this is a lunar eclipse. The red circle shows you where the shadow of the earth is, when the moon passes through the red circle we get a partial or total lunar eclipse.

As above.

The heart shaped picture represents a hemi-sphere unwrapped. The hemi-sphere is the sky as viewed from the current location. The blue lines on the sky are the lines of bearing and elevation relative to your location on the earth’s surface. These do not move. Each line is separated from the next by 15 degrees - 90º elevation is dead overhead, 0º is on the horizon. A bearing of 0º is due north, 90º due east, 180º due south etc.

The dark red lines describe celestial co-ordinates. These are fixed relative to the stars. As the earth revolves these move across the sky, revolving around a point close to the pole star.

The bright red line is the celestial equator. The bright green lines mark the limits of the area which the sun appears to move through during the course of the year. In the summer it will be near the upper green line, in winter near the lower green line.

The yellow line is the "ecliptic" - that is the apparent path that the sun follows against the background of the stars during the course of the year. Most of the planets also trace a path close to the ecliptic.

The Julian date is based on the calendar established by Julius Caesar and is what astronomers use to measure time. It is defined as the number of days since "Greenwich mean noon on January 1^st, 4713 b.c.". Note that it is measured from noon so each new "Julian" day starts at noon GMT.

For more details on the Julian date click here.

I want SunClock to start up as soon as the computer boots up. How do I
achieve that? 

It is not entirely straightforward, and depends a bit on what version of windows you are running. If you're running win2000 or XP then:

1. In windows explorer go to c:\Documents and Settings\[user name]\Application data\Map Maker.

2. There you'll see a file called MMManger.exe, right click on it to create a shortcut.

3. Right click on the shortcut and click on Properties.

4. In Target, after the file name enter a space followed by: 0 SunClock5 play

5. Close the Properties window then move the shortcut icon to: 
c:\Documents and Settings\[user name]\Start menu\Programs\Startup

When you next start Windows it will start up Sun Clock.

If you're running win98/ME then MMManager will be in c:\Windows\Application data\Map Maker, and the shortcut should go in c:\windows\Start menu\Programs\Start up

How can I uninstall sun clock?

On the Windows task bar click with the left mouse button on the sun icon. This displays a small menu. Click on Uninstall sun clock.

When I try to start sunclock I get a Wininit.dll error message?

Early versions of Windows 95 used a couple of system files that are not compatible with Sun Clock. These two files can be replaced with later versions with out adversely effecting Windows (though we suggest keeping back-ups of the old files just in case). The two files are in the c:\windows\system directory and are called wininet.dll and shlwapi.dll. The updated versions of these two files can be downloaded here.