Edit Menu - Preferences Choose Preferences from the Edit menu.

HourWorld™ provides a preferences screen that allows you to adjust various display options.  To select an option, click on the appropriate button or menu, and then click OK.

• Setting System Clock - Allow or Prevent  - When you change HourWorld™'s time or reset the home location to a different time zone, HourWorld™ will adjust its internal time accordingly.  When you quit HourWorld™, and choose to save the new settings, your system clock will be adjusted to match.  If you wish to reset your system clock with other software, and to prevent HourWorld™ from adjusting your system clock, click the "Prevent" button.  "Allow" is the default setting.

• Map Grid - Show or Hide - "Show" is the default setting.  Latitude and longitude lines are shown every 15° around the world.  The earth turns at the rate of 15° per hour.

• Tropics, Circles, Equator - Show or Hide - "Show" is the default setting, displaying Arctic and Antarctic Circles, the Tropics of Cancer and  Capricorn, and the Equator.  Between the Arctic or Antarctic Circles  and the poles, there are some days each year when the sun never sets or rises.  The sun never moves North of the Tropic of Cancer, nor South of the Tropic of  Capricorn.  Between the Tropics,  there is at least one day each year when the sun passes directly overhead.

• Azimuth/Distance/∆T Information on Clocks - Show or Hide  "Show" is the default setting.  "Hide" displays plain analog clocks without this information overlay.

• Nighttime Region - Lighter or Darker - "Darker" is the default setting. Adjust the darkness of the nighttime region on your display.

• Twilight Region - Show or Hide - "Show" is the default setting. HourWorld™ uses the speed of the PowerPC processor to calculate and display the varying depth of twilight around the globe, as daylight dims toward full darkness.  This feature requires a considerable amount of processor attention.  Selecting "Hide" turns off this  feature, allowing the program to respond faster to changes in settings.

• Apple Location Manager - Use or Ignore - "Ignore" is the default setting.  If you are using a PowerBook with Apple Location Manager, please see the section in this manual on how HourWorld™ works together with the Location Manager to automate changes in your location settings.

• Show Distances In - Miles or Km - "Miles" is the default setting.  Each of the analog clocks on the "Clocks" screen  shows the distance from the "Home Location" to the location represented by that  clock.  Click "Km" to change the display to kilometers.  "Miles" refer to statute miles of 5280 feet, not nautical miles.

• Time Format - AM/PM or 24-Hour - "AM/PM" is the default setting.  HourWorld™ as shipped assumes that you are a U.S. user, with the System Date and Time formats set the way they were when your system software was installed - to U.S. format, with 12-hour time.  If these are the settings you are using (you can verify by using the Date andTime Control Panel), you can set HourWorld™ to display in 24-hour format by clicking the 24-Hour preference.

• Background Processing - On or Off - "On" is the default setting, enabling HourWorld™ to keep displaying the correct time  and world situation  even when you are using a different program.  Some users have reported that they like to keep HourWorld™ running on a second monitor, while they use other software on the main monitor.  HourWorld™ updates itself once at the beginning of each minute, and you may notice a slight processing interruption  in the program you are using while this occurs.  If this is bothersome, and you want to leave HourWorld™ open, then you may wish to turn background processing  off. With background processing off, HourWorld™ will update itself only when it is the active (frontmost) process.

• Call Coordinator Display - The "Calling Times" option displays up to four user-settable calling time "windows" for each location.  "Day/Night" shows the hours of day, night, and twilight.

• Default Display - Clocks, Sunrise Today, Sun Calendar, Moon Calendar, or Sundial - Use the pop-up menu to select which screen you want to first appear each time you  open HourWorld™.

• Default Size - Small, Medium (VGA), Large (SVGA) or Extra Large (XGA) Use the pop-up menu to select the screen size you want when you open HourWorld™.  The SVGA and XGA options will be available only if the software is registered as the SVGA version and the monitor or display is 800x600 pixels or larger.  The XGA display is designed for monitors with 1024 x 768 pixel resolution.